1966 New York City smog

1966 New York City smog
A black-and-white, panoramic view of New York City as seen from a great height. A vast number of buildings and skyscrapers can be seen. A hazy, smoky gas overlays the entire city like a blanket, with a fairly clear skyline only in the far distance at the horizon. Near the closest buildings, the smog appears thin and wispy. The smog appears thicker and thicker around buildings that are farther away from the photographer's position, until shorter buildings near the horizon are almost entirely shrouded and impossible to see under a thick layer of smog. Near the horizon, the clustered tops of tall skyscrapers emerge from within the smog.
On November 25, 1966, the front page of The New York Times featured this image, taken the morning before, of the view looking south from the Empire State Building.[1] Roy Popkin of the EPA said the "surrealistic" image made Lower Manhattan look like a science-fiction "Cloud City".[2]
DateNovember 23–26, 1966
LocationAcute smog in New York City; lesser smog throughout the New York metropolitan area
Coordinates40°42′47″N 74°00′22″W / 40.713°N 74.006°W / 40.713; -74.006Coordinates: 40°42′47″N 74°00′22″W / 40.713°N 74.006°W / 40.713; -74.006
CauseHeat inversion over East Coast[3]
There are several estimates for the number of casualties caused by the smog:
  • 168 (estimate from 1967 medical study)[4]

The 1966 New York City smog was an air-pollution event, with damaging levels of carbon monoxide, sulfur dioxide, smoke, and haze. Smog covered the city from November 23 to 26, which was that year's Thanksgiving holiday weekend. It was the third major smog in New York City, following events of similar scale in 1953 and 1963.

On November 23, a large mass of stagnant air over the East Coast trapped pollutants in the city's air. For three days, New York City was engulfed in high levels of carbon monoxide, sulfur dioxide, smoke, and haze. Smaller pockets of air pollution pervaded the greater New York metropolitan area, including parts of New Jersey and Connecticut. By November 25, regional leaders announced a "first-stage alert". During the alert, leaders of local and state governments asked residents and industry to take voluntary steps to minimize emissions. Health officials advised people with respiratory or heart conditions to remain indoors. The city shut off garbage incinerators, requiring massive hauling of garbage to landfills. A cold front dispersed the smog on November 26 and the alert ended.

In the months that followed, scientists and doctors studied the smog's impact. City health officials initially maintained that the smog had not caused any deaths, but it soon became clear that the smog had been a major environmental disaster with severe public health effects. A December 1966 study estimated that 10% of the city's population had suffered adverse health effects, such as stinging eyes, coughing, and respiratory distress. A statistical analysis published in October 1967 found that 168 people had likely died because of the smog.

The smog catalyzed greater national awareness of air pollution as a serious health problem and political issue. New York City updated its local laws on air pollution control. Prompted by the smog, President Lyndon B. Johnson and members of Congress worked to pass federal legislation regulating air pollution in the United States, culminating in the 1967 Air Quality Act and the 1970 Clean Air Act. The 1966 smog is a milestone that has been compared with other pollution events, including the health effects of pollution from the September 11 attacks and pollution in China.


Smog in general and types of smog

Los Angeles, shrouded in haze
Smog over Los Angeles, 1973

The word "smog" (a portmanteau of "smoke" and "fog") is used to describe several forms of air pollution commonly found in urban and industrialized areas.[5][6] There are several ways to define and categorize types of smog, with some sources defining two main types of smog: smoky "London Pea soup"-style smog and hazy "Los Angeles"-style smog.[7]

London smog and Los Angeles smog are not exclusive to their namesake cities, and are found in urban areas throughout the world.[7] Additionally, both types of smog are commonly found together in the same region.[7] At the time of the 1966 smog and in the two decades prior, air pollution in New York City combined the characteristics of London smog and Los Angeles smog: the city's smog in that period was caused by both stationary sources such as industrial coal-burning[9][12] and mobile sources such as motor vehicles.[3][13]

Although smog is a chronic condition, unfavorable weather conditions and excessive pollutants can cause intense concentrations of smog that can cause acute illness and death; because of their unusual visibility and lethality, these intense smog events have often been publicized in the media[5][14][15] and are typically described as disasters or, more specifically, environmental disasters.[3][16] An acute "smog event" may also be called simply "a smog", a smog "episode", or a "killer smog" (if it caused, or had the potential to cause, deaths).

Smog in the United States and New York City before 1966

Many buildings and skyscrapers seen from a great height, surrounded by smog. Unlike the previous image above, no horizon can be seen as the entire sky is blotted out by the smog. If the position of the prior photo was "above" a blanket of smog, this photo is completely underneath and within it.
The Chrysler Building as seen from the Empire State Building on November 20, 1953, during the six-day smog that caused at least 200 deaths.[17]

Even before the 1966 smog episode in New York City, it was known by scientists, city officials, and the general public that the city—and most major American cities—had serious air-pollution problems.[6][18][19][20] According to scientific studies from the period, more than 60 metropolitan areas had "extremely serious air pollution problems" and "probably no American city of more than [50,000] inhabitants enjoys clean air the year round".[6] The air "over much of the eastern half of the country [was] chronically polluted," and the cities with the most intense air pollution were New York City, Chicago, Los Angeles, St. Louis, and Philadelphia.[6]

New York City's air pollution was reportedly the worst of any American city.[19] Although the "persistently glaring" photochemical smog of Los Angeles was more visible, more "infamous,"[14] and received a greater degree of public attention,[20] New York City had more total emissions and many more emissions proportional to its area.[19] Despite its higher emissions, New York City's landscape and weather normally prevented smog from concentrating at high levels,[19] meaning the smog was mostly invisible most of the time.[20] Unlike Los Angeles, which is surrounded by mountains that tend to trap airborne pollutants, New York City's open topography and favorable wind conditions usually dispersed pollutants before they could form concentrated smog.[19] If 1960s New York City had surroundings and a climate like those of Los Angeles, pollutants would not have escaped as easily and smog would have made the city uninhabitable.[19]

The smog event of 1966 was preceded by two other major smog episodes in New York City: one in November 1953, and one in January–February 1963.[a] With the use of statistical analysis comparing the number of deaths during periods of smog with the number of deaths during the same time in other years, medical scientists led by Leonard Greenburg determined that excess deaths[b] occurred during those smogs. From the observation of excess deaths, Greenburg inferred that the smog caused or contributed to those deaths.[23] An estimated 220–240 deaths were caused by the six-day 1953 smog,[17][24][25] and an estimated 300–405 deaths were caused by the two-week 1963 smog.[17][21] Other minor episodes of smog occurred in the city prior to 1966, but were not accompanied by statistically significant excess deaths.[21]

City air monitoring

In 1966, New York City had only a single air quality measurement station: the Harlem Courthouse (pictured in 2009).[26]
Location of the Harlem Courthouse in New York City

In 1953, the city opened a laboratory to monitor pollution that would become its Department of Air Pollution Control.[27] At the time of the 1966 smog, air quality measurements were recorded from only a single station, the Harlem Courthouse building on East 121st Street,[26] run by Braverman and his staff of 15.[27] Taking measurements from a single station meant that the index reflected conditions in the immediately surrounding area, but served as a crude, unrepresentative gauge of overall air quality across the entire city.[28][26] The Interstate Sanitation Commission, a regional agency run by New York, New Jersey, and Connecticut and headquartered at Columbus Circle, also relied on the Harlem Courthouse laboratory. Formed in 1936, the advisory agency was authorized in 1962 by New York and New Jersey to oversee air pollution issues.[29]

The department quantified pollution using an air quality index (AQI), a single number based on combined measurements of several pollutants.[1] AQI measurements in the United States are now standardized and overseen by the EPA, but at the time different regions used "a confusing and scientifically inconsistent array of air quality reporting methods".[30]

By 1964, the department had developed an AQI called the SCS Air Pollution Index (SCS API), combining measurements of sulfur dioxide (SO2), carbon monoxide (CO), and coefficient of haze (also called smoke shade) into a single number. The city laboratory recorded the presence of those three pollutants measured in amount (by concentration in the air) and duration.[1] SO2 and CO were measured by parts-per-million, or ppm, and smoke shade was measured in mppcf (millions of particles per cubic foot); the department continuously monitored these pollutant levels and recorded their hourly averages.[31] The data for those three pollutants were combined into a single number using a weighted formula developed by department co-founder Moe Mordecai Braverman.[28] The SCS API formula was:[32][33]

(SO2 × 20) + (CO × 1) + (smoke × 2) = SCS API

The index average was 12, with an "emergency" level if the index was higher than 50 for a 24-hour period.[1] The average of 12 was determined from data collected between 1957 and 1964 showing average levels of 0.18 ppm SO2, 3 ppm CO, and 2.7 mppcf smoke levels: (0.18 × 20) + (3 × 1) + (2.7 × 2) = 12 SCS API.[34] The "emergency" level of 50 was announced in 1964.[28] The index system used by the city in 1966 is not in use anywhere today and was unique to the city even at the time; the 1966 smog itself prompted scientists to reexamine and improve the city's methodology for recording air-pollutant levels.[35]

Using the SCS API, the city adopted an air-pollution alert system with three stages of alert, matching increasingly severe levels of pollution with corresponding counteractions. The city announced its only first-stage alert in 1966; second- and third-stage alerts were never reached.

New York's SCS API alert system in use in 1966[1][36]
Alert level Measurements SCS API Required conditions to trigger alert Counteractions
First-stage alert 0.7 10 7.5 39 [50] Total SCS API exceeds 39 for four hours and the Weather Bureau predicts the inversion will last another 36 hours. Although 39 was the official SCS API level required to trigger a first-stage alert, 50 was the level actually used. The city government would ask residents to voluntarily reduce their fuel consumption and car use.
Second-stage alert 1.5 20 9.0 68 Total SCS API exceeds 68 for two hours. The city would ban the use of fuel oil, sets a cap on industrial emissions, and asks New Yorkers to stop all transportation—on a voluntary basis—unless essential.
Third-stage alert 2.0 30 10.0 90 Total SCS API exceeds 90 for one hour. The city would impose mandatory "brownout" conditions, placing a curfew on lighting and heating and curtailing all but "essential" transportation and industry.

Braverman later admitted that the "emergency" alert level of 50 SCS API had been chosen on an essentially arbitrary basis:

No one knew what to do next [after they had determined the average level of smog in the city was 12], so I just said, "If it's four times as high, that's an emergency."[28]

Another defect of the SCS API alert system was that it relied on a balance of multiple pollutants but would disregard fatal levels of any one pollutant under certain conditions. Critics pointed out that the index could have allowed the city to reach lethally high levels of carbon monoxide without triggering any alert, so long as the levels of other pollutants remained low.[28] However, the department had to contend with the fact that no universally accepted standards for recording smog existed at that time, so the SCS API's flaws were accepted for lack of a better alternative.[28] During the 1966 smog, one of the former commissioners said he would have readily adopted a better system if one had existed.[28]


Dr. Helmut F. Landsberg, a climate scientist with the federal Weather Bureau, predicted in 1963 that the Northeastern and Great Lakes regions could anticipate a major smog event every three years due to the confluence of weather events and trends like growing population, industrialization, and increased emissions from cars and central heating.[37] In early 1966, Dr. Walter Orr Roberts—director of the National Center for Atmospheric Research—warned of the imminent threat of a smog event with the potential to kill as many as 10,000 people.[38] Roberts identified Los Angeles or New York City as the cities most vulnerable to a large-scale lethal smog in the United States, and London, Hamburg, or Santiago as other the most vulnerable internationally.[39] Asked if "many" American cities were vulnerable to a disaster smog event, Roberts replied, "Yes. I have been worried that we would wake up some morning to an unusual meteorological situation that prevented the air from circulating and that we might find thousands of people dead as the result of the air they were forced to breathe in that smog situation."[40]

The mayor's office established a 10-member task force headed by Norman Cousins (known as the editor of the weekly magazine Saturday Review) to study the problem of air pollution.[19] The task force published a 102-page report in May 1966, finding that the city had the most polluted air of any major city in the United States, with a wider range and greater total tonnage of pollutants than Los Angeles.[19] The task force criticized the city for lax enforcement of pollution laws, even naming the city itself the biggest violator, with municipal garbage incinerators "operat[ing] in almost constant violation" of its own laws.[19] The report warned "all the ingredients now exist for an air-pollution disaster of major proportions"[19] and that the city "could become a gas chamber" in the wrong weather conditions.[25]

A July 1966 report by the New York Academy of Medicine Committee on Public Health cautioned that New York City's air-pollution problem made it susceptible to acute and lethal episodes and recommended a reduction of air pollution.[41] Further, the report concluded that scientists had likely not identified the full range of harmful pollutants or health effects caused by air pollution.[42]

Timeline of smog event

November 19–23: stagnant air traps pollutants

Dense, smokey air lays over a cityscape like a blanket. In the distance, a mountain range and clear blue sky can be seen.
Smog trapped under an inversion in Almaty, Kazakhstan—similar to the atmospheric conditions of the 1966 New York City smog.

In November 1966, New York City was experiencing an unseasonably warm "Indian summer".[3] A cold front from Canada brought clean air to the city on November 19, but the cold front was held in place by pressure from the higher atmosphere.[12] An anticyclonic temperature inversion[43]—in other words, a warm, mostly stationary air mass located atop a cooler air mass—formed over the East Coast on November 20.[44]

Unlike atmospheric convection—the ordinary process of lower, warm air rising—inversions leave cooler air suspended below warm air, preventing the lower air from rising and trapping airborne pollutants that would ordinarily disperse in the atmosphere.[45] Such weather events are common, but they are usually followed by a strong cold front that brings an influx of clean air and disperses pollutants before they have enough time to become highly concentrated; in this case, a cold front approaching west through southern Canada was delayed.[46] When explained in less formal terms, the process of an inversion causing a smog event has been compared to a lid that holds in pollutants[45] or a balloon that fills with pollutants.[12] In general, smog events occur not because of a sudden increase in a region's output of pollution, but rather because weather conditions like stagnant air prevent the dispersal of pollutants that were already present.[47]

The inversion prevented air pollutants from rising, thereby trapping them within the city.[43] The smog event itself started on Wednesday November 23, coinciding with the beginning of the long Thanksgiving weekend.[2] The material sources of the smog were particulates and chemicals from factories, chimneys, and vehicles.[3] Sulfur dioxide levels rose.[43] Smoke shade, a measure of visibility interference in the atmosphere, was two to three times higher than usual.[43]

Refer to caption.
These weather maps show winds at 18,000 feet from November 21–26, 1966. A mass of warm air spreading east and south above the East Coast created the inversion that trapped pollutants near the ground.[48]

November 24: Thanksgiving Day

     We were flying at about two thousand feet, through a curiously greasy-looking and pervasive haze. The ground could just be made out below—cars, roads, houses, all dim but visible.
     Then we began to climb. In less than a minute the ground had vanished. Cars, roads, houses, the very earth itself had been blotted out. We were circling in bright sunlight, above an apparently limitless bank of opaque, polluted air. The smog extended to the horizon in every direction. At a distance, the slanting rays of the sun gave it a coppery, rather handsome appearance. Nearer at hand it merely looked yellow and ugly, like nothing so much as a vast and unappetizing sea of chicken soup.

William Wise, describing his view from an airplane delayed in landing at John F. Kennedy International Airport. Wise was returning from London, where he had been researching the 1952 Great Smog of London.[49]

The city chose not to declare a smog alert on Thanksgiving Day, but The New York Times later reported that city officials had been "on the verge" of calling an alert.[1] Austin Heller, the city's commissioner of air pollution control, said he nearly declared a first-stage alert between 6 a.m. and 10 a.m. on November 24.[c] Heller said the index had reached a high of 60.6—10 points higher than the "emergency" mark—between 8 and 9 p.m., and the 60.6 reading was possibly the highest in the city's history.[1] After a nighttime lull, Heller cautioned, the smog would likely spike again in the morning.[1]

The unusually heavy smog was evident to the crowd of one million onlookers at the Macy's Thanksgiving Day Parade.[2] Tabloids and newspapers that ordinarily ran front-page stories about the parade instead carried stories about the smog.[2] Health officials cautioned those with chronic lung diseases to stay indoors and advised patients that symptoms of pollution-related illness usually lagged 24 hours after exposure.[1]

That day, the city closed all 11 of its municipal garbage incinerators.[1][50] Energy companies Consolidated Edison (called Con Ed for short) and Long Island Lighting Company were asked to burn natural gas rather than fuel oil to minimize the release of sulfur dioxide;[1] both companies voluntarily cut back emissions, with Con Ed reducing its emissions by 50 percent.[51] The city told 18 inspectors "to forget their turkey dinners and start looking for dirty air," and they issued an "unusually high" number of citations for emissions violations, including two for Con Ed plants.[51] Representative William Fitts Ryan of Manhattan sent a telegram to Secretary of Health, Education and Welfare John W. Gardner to request an emergency meeting with New York Governor Nelson Rockefeller, New Jersey Governor Richard J. Hughes, and other regional leaders.[1]

November 25: first-stage alert declared

New Yorkers went to work [the morning of November 25] in acrid, sour-tasting air that was almost dead calm. Many had headaches that were not the product, they thought, of holiday over-eating. Their throats scratched. But no deaths were attributed to the smog...

Homer Bigart, "Smog Emergency Called for City," front-page article for the November 26, 1966 edition of The New York Times[51]

By Friday November 25, a first-stage alert for the New York metropolitan area, including parts of New Jersey and Connecticut, was declared through newspaper, radio, and television announcements.[51] Governors Rockefeller and Heller attended a press conference with Deputy Mayor Robert Price standing in for Mayor Lindsay, who was on vacation in Bermuda.[51][d] The announcement "was believed to be the first appeal ever made to New York's citizens in connection with a smog problem".[2] Conrad Simon, who acted as a liaison between the scientific and political communities during the crisis, later said "We came close to closing the city down."[2]

Pollution was not as high in New Jersey or Connecticut as in New York, but it was still significant. New Jersey reported what was then its worst-ever smog. Elizabeth, New Jersey had smog at half the levels of New York City. A Connecticut health official reported air pollution four times higher than average, but the impact in Greenwich, Connecticut was considered minimal. The nearby New York counties of Nassau, Suffolk, and Westchester reported very little smog.[51][53] Although not part of the area covered by the alert, unusually high smog was reported as far as Philadelphia, Pennsylvania and Boston, Massachusetts,[e] whose mayor issued a similar health warning.[54]

The alert was declared upon the advice of the Interstate Sanitation Commission. Members of the commission had been monitoring the smog situation in shifts for three days, nonstop. Thomas R. Glenn Jr., the commission's director and chief engineer, recommended the alert at 11:25 a.m. after seeing instruments in New York and New Jersey that showed carbon monoxide greater than 10 ppm (parts-per-million) and smoke greater than 7.5 ppm, both for more than four consecutive hours.[29]

In New York, the city asked commuters to avoid driving unless necessary, and apartment buildings to stop incinerating their residents' garbage and turn heating down to 60 °F (15 °C).[51] New Jersey and Connecticut asked their residents not to travel, and to use less power and heat.[51] Although it was a workday, traffic was light in New York City.[51] A check on 303 buildings of the New York City Housing Authority later found near-total cooperation with the city's requests. Private residences were believed to have had a high rate of voluntary cooperation with the city's plea to cut energy consumption.[26]

The weather forecast called for the heat inversion to end that day, followed by a cold wind that would disperse the smog.[51] Nevertheless, Heller said that if the wind did not come, a first-stage alert would likely remain in effect and it might become necessary to declare a second-stage alert if conditions worsened.[51]

November 26: cold front arrives

External audio
"Commissioner Heller Announces Lifting of Air-pollution Emergency" (November 26, 1966) — press conference with Commissioner Heller announcing the end of the alert. From the WNYC archives.

Rain came in the night. The cold front that would blow away the smog was forecasted to arrive between 5 a.m. and 9 a.m.[26] Shortly after 9 a.m. the wind arrived, moving mostly from the northeast between 6–10 miles per hour and bringing cooler temperatures in the 50s °F (10–15 °C).[26] Glenn at the Interstate Sanitation Commission sent a message advising the alert to end at 9:40 a.m., based on weather and air readings.[29] Shortly after noon, Governor Rockefeller declared the end of the alert; New Jersey and Connecticut also ended their alerts that day.[26]

Health effects from the smog were downplayed in most early reports. Some hospitals reported increased admissions of patients with asthma.[51] An official at the city Department of Health noted that some hospitals were receiving fewer asthma patients, and attributed the reported increases to ordinary random fluctuations.[51] The official told The New York Times that "[i]n not one [hospital] is a pattern emerging which would suggest we are dealing with an important health hazard as of this moment."[51] By this time, the inability to incinerate garbage had generated a large amount of excess waste. Hundreds of sanitation workers worked overtime to transport garbage to landfills in the Bronx, Brooklyn, and Staten Island,[51] with the bulk going to Fresh Kills in Staten Island.[50]


The atmosphere of New York was bombarded with more man-made contaminants than any other big city in the country—almost two pounds of soot and noxious gases for every man, woman, and child. So great is the burden of pollution that were it not for the prevailing wind, New York City might have gone the way of Sodom and Gomorrah.

John C. Esposito, Vanishing Air (1970)[55]

Initial estimates of health effects and casualties

It was not initially clear to the medical community how many casualties and illnesses had been caused by the smog—or indeed, whether the smog had caused any casualties at all. The population of the area affected by the smog has been estimated at 16 million.[56] A November 26 story by Jane Brody in the New York Times cautioned that it would likely take "a month or more" before investigators had enough data to assess whether the smog had caused any deaths.[57] Three days later, after studying admissions to municipal hospitals for cardiac and respiratory complications, the city commissioner of hospitals Joseph V. Terenzio told the press "I can report almost with certainty that there was no detectable immediate effect on morbidity and mortality because of the smog. ... It now seems unlikely that final statistical analysis will reveal any significant impact on the health of New York City's population."[58] Early reports of injuries focused not on respiratory damage, but on car or boating accidents caused by poor visibility.[3]

Nonfatal health effects were difficult to measure in the smog's immediate aftermath.[57] Some of the health effects were themselves delayed; for example, most of the serious effects on the elderly population would only manifest days after initial exposure.[57] A study on the smog's nonfatal health effects was published in December 1966. The study, conducted by a nonprofit health research group, found that 10 percent of the city's population suffered some negative health effects from the smog, including symptoms like stinging eyes, coughing, wheezing, the coughing-up of phlegm, or difficulty breathing.[59] The director of the research group said anything serious enough to adversely affect as much as 10 percent of the population, like the smog had, indicated the existence of a serious public health problem.[59]

Subsequent estimates of casualties

The earliest report of casualties came in a special message by President Lyndon B. Johnson sent to Congress on January 30, 1967. In the message, the president said 80 people had died in the smog.[60] Johnson did not cite a source for that claimed estimate of deaths, and there is no known source concluding that 80 people died other than those citing Johnson.[f]

Two major medical studies have analyzed the extent of casualties from the smog. Leonard Greenburg—the same medical researcher who had previously published findings on the death count of the 1953 and 1963 smogs—published a paper in October 1967 showing that the previous year's smog had likely killed 168 people.[4] Greenburg showed that there were 24 deaths in excess[b] of how many would normally be expected at that time of year every day, over a period of seven days—using a period four days longer than the smog itself had lasted because of the delay between smog exposure and resultant health effects.[4] Greenburg said that his analysis could not account for damage during the smog that would remain latent and continue to cause disease and death for years.[4] The results of Greenburg's paper were reported by The New York Times.[4]

The smog was compared to the 1948 smog in Donora, Pennsylvania and the Great Smog of London of 1952, both of which lasted five days.[61] The London smog's death toll of 4,000 was far higher than Donora, but the smog in Donora was far more severe; at the time of its smog, Donora was a small industrial town with a population of only 13,000, and its population was proportionally hit much harder with 20 deaths and smog-related illnesses among 43 percent of the population.[61] Pollution experts estimated that if a smog as strong as the Donora smog had occurred in the much more populous New York City, the death toll could have been as high as 11,000 with four million ill.[61]

Urban life and smog

Circumstantial factors helped to offset the smog's potential strength and health damage.[25][62] The event began over the long Thanksgiving weekend, not the workweek, meaning that many factories were closed and far fewer people were in traffic than normally would be.[62] The warm weather meant the demand for central heating was also lower than usual.[62] On November 25, the high of 64 °F (18 °C) broke the previous record high for that date, leading the reporter Homer Bigart to describe the apartment-heating restrictions as "no problem."[51] Because of these factors, pollution—and the death toll—were likely lower than they could have been otherwise.[62]

An industrial plant, with a mess of household trash items strewn haphazardly on the ground in front of it.
The incinerator plant at Gravesend Bay in Brooklyn, pictured in 1973. The 1966 smog event demonstrated the ways in which disparate problems of urban life, such as waste management and air pollution, are interconnected.

The smog brought into focus the complexity and interdependency of environmental problems and other issues of urban life.[50] Attempts by city government to react to the smog had unintended negative side effects of their own; as Mayor Lindsay reflected in his 1969 book The City, "[e]very time you shut down an incinerator, you increase the amount of garbage on city streets."[50] Efforts to address a given environmental problem can cause undesired side effects, sometimes unforeseeable, which are often related to a city's limited resources.[50]

Environmental harms in general are linked to urban decay and social inequality. After the 1966 smog, the task of eliminating or reducing air pollution became an essential part of the goal to make "the city attractive again to the middle class and acceptable to all its residents."[50] Such harms—but especially those that create obvious and unpleasant effects, as smog does—were among the factors that, historically, motivated and exacerbated white flight[g] from American cities, including New York City, in the mid-20th century.[50] The mass migration of affluent residents, whether individually motivated by unpleasant environmental factors like smog in whole or in part, drained the city's tax base and resulted in a loss of human resources for the city's economy.[50] Residents who remained in the city often had no choice whether to stay or to leave because they lacked the resources that would enable them to move.[50] Those residents then saw the burdens of pollution—including the direct effects of pollution itself, indirect effects of city reactions to pollution (for example, uncollected garbage in the streets), and other problems stemming from lack of municipal resources after white flight—as "emblems of larger governmental neglect and social inequality".[50]

Political reaction

National attention

The smog is commonly cited as one of the most-visible and most-discussed environmental disasters of the 1960s in the United States, alongside the 1969 Santa Barbara oil spill and the 1969 Cuyahoga River fire.[63][64][65] National public awareness of the smog and its health effects spurred the nascent environmental movement in the United States and galvanized support for legislation to regulate air pollution.[66][67] Vernon McKenzie, chief of the air pollution division of the federal Public Health Service, called the smog "a warning of what can happen—and will happen—with increasing frequency and in wider areas unless something is done to prevent it."[58] In the 1968 book Killer Smog, William Wise warned that the 1966 smog and the 1952 London smog represented a vulnerability to air pollution disasters among American cities:

Perhaps, as in Great Britain, change will begin to come only after a large-scale tragedy. The conditions are favorable for one in any of a dozen of the nation's most populous cities. A mass of still air drifting slowly eastward, an intense thermal inversion, and then five, six, seven days of increasingly poisonous smog. The air will look bronze, almost copper-colored, as it did during New York's 1966 Thanksgiving smog. ... From every appearance, a similar tragedy is now being prepared in America—and there is very little time left in which to prevent it.[68]

At the time of the smog event, only half of the urban population of the United States lived with local protections on air quality; the smog event catalyzed the call for federal regulation on the issue.[67] Spencer R. Weart of the American Institute of Physics said the American public "did not take the problem [of air pollution] seriously" until the 1966 smog.[69] According to Weart, an important factor driving awareness of the smog was its location, as events in New York "always had a disproportionate influence on the media headquartered there."[69]

Municipal response

Refer to caption.
John Lindsay (pictured in April 1966) was the mayor of New York City during the 1966 smog.
A morning skyline of New York City, with docks and the ocean visible at the bottom and progressively thicker haze into the distance. Only the outlines of far buildings can be seen, with details like windows or architectural features impossible to distinguish.
Smog in May 1973. By 1972 New York City had cut levels of sulfur dioxide and particulates by half from their peak.[62]

Before the 1966 smog, the city government had been slow to act to regulate air pollution.[70] Despite general awareness of the health and environmental impacts of smog, other problems took priority: as The New York Times reported, issues like "housing, crime, education and keeping the city 'cool' were at the forefront of city government concerns."[70] But the 1966 smog impelled a swift response by the city government,[71][72] who now felt pressure to respond "in the aftermath of disaster."[70] Lindsay, then a liberal Rockefeller Republican, had run as a supporter of stronger air pollution control in his 1965 mayoral campaign, and the 1966 smog reinforced Lindsay's position on the issue.[71]

City Council member Robert A. Low, a Manhattan Democrat and chairman of the city subcommittee on air pollution, criticized Lindsay for failing to enforce an air-pollution bill that had been passed in May.[73] The bill, authored by Low, would update city incinerators and require apartment buildings to replace their incinerators with other garbage disposal methods.[73] Low accused Lindsay's administration of "dragging its feet" on the problem of air pollution,[73] which Lindsay called a "political attack."[58]

The mayor's office prepared a report in the aftermath of the smog, singling out the coal-burning Consolidated Edison company, city buses, and apartment building incinerators as significant contributors to air pollution.[71] The report noted that the change in weather that dispersed the smog "spared the city an unspeakable tragedy," and that if New York City had stagnant smog at the high levels commonly found in Los Angeles, "everyone in the city would have long since perished from the poisons in the air."[74] Consolidated Edison began using a fuel with lower sulfur content, and by June 1969 the city had reduced the level of sulfur dioxide in the air by 28 percent.[70]

In December 1966, the New York City Administrative Code section on pollutant levels in the air was strengthened[62] by a bill that was later described as the "toughest air pollution control bill in the country" at that time.[72] Lindsay announced a plan to install 36 new stations for the Department of Air Pollution Control to measure air pollution levels throughout the city—an upgrade from the sole station in the Harlem Courthouse building. The stations would send data to a central computer using telemetry to create a profile of the city atmosphere.[26][29] Five of those stations would also send data to the Interstate Sanitation Commission.[29] The city purchased a computer system and equipment from the Packard Bell Company for $181,000 ($1.06 million in 2018 dollars[75]).[76]

In November 1968, the city opened 38 monitoring stations, 10 outfitted with computer equipment. The 10 computerized stations were designed to send data every hour to the central computer, while the other 28 operated manually as backup.[35] The old index system used during the 1966 smog, which produced a single number from multiple measurements, was abandoned as simplistic and unhelpful.[35] The new index system was similar in that it used weather forecasts and measurements of pollutants in the air and had three progressive stages of severity ("alert," "warning," and "emergency") requiring stronger actions by city, industry, and citizens.[77]

The city's actions mitigated air pollution and reduced the likelihood of a major smog event on the same scale.[70] In contrast to dire warnings from the mayor's air-pollution task force in its May 1966 report, a city official said in 1969 "[w]e probably have the possibility of a health catastrophe under control now."[70] The city declared minor smog alerts in 1967 and 1970;[78][79] conversely, a four-day inversion similar to the Thanksgiving weather of 1966 occurred in September 1969, but it passed without incident—neither smog nor deaths resulted.[62] Norman Cousins, chairman of the mayor's task force, credited the regulations enacted since the 1966 smog for the prevention of a comparable September 1969 event. Cousins wrote in a message to Lindsay:

New York City's air is cleaner and more breathable today than it was in 1966. ... It is important to ask what would have happened on those days [in September 1969] if the pollution levels had continued to worsen at the same rate of deterioration that occurred from 1964 to 1966. The answer is that there could have been a substantial number of casualties. The fact that an episode did not occur attests to the capability of the City's programs to protect its air resources.[62]

After the passage of strict new state and federal air regulations, the city passed its updated Air Pollution Control Code in 1971, designed in part to address concerns that nitrogen oxides and unburned hydrocarbons had been left insufficiently controlled by the previous changes.[62] By 1972, New York City had cut levels of sulfur dioxide and particulates by half from their peak.[62] According to an article published by the EPA Journal in 1986, those improvements at the city level were "the legacy of concern that emerged after the 1966 Thanksgiving Day smog disaster."[62]

States' responses

Refer to caption.
Following the 1966 smog, air-pollution control became a major policy objective of both Nelson Rockefeller (left), the Republican Governor of New York, and Lyndon B. Johnson, the Democratic President.

Prior to 1966, air-pollution control had largely been the responsibility of states and political subdivisions of states like counties and municipalities (cities and towns).[80][81] The federal government played little role in air-pollution control, and to the extent that it did, its actions supported the efforts of states and local governments.[82] For example, federal law provided resources like research, training, grants to improve state and local programs, and a conference procedure to convene agencies and polluters under the guidance of the Department of Health, Education and Welfare.[82] Direct regulations—such as, for example, setting emissions standards—were left to states.[82]

The governors of New York (Rockefeller), New Jersey (Hughes), Delaware (Charles L. Terry Jr.), and Pennsylvania (Raymond P. Shafer) met in December 1966 to address air pollution in their region.[83] Each governor pledged to enforce their state's pollution abatement laws and to prevent their own state from becoming a "pollution haven" with lax regulations to attract industry.[83]

At the same meeting, the governors also discussed the possibility of new tax incentives to motivate industry to reduce pollution and the creation of a new interstate compact[h] to set industry standards, which would require adoption by all member states and approval by Congress.[83] Those four states were already members of the Delaware River Basin Commission (DRBC), an interstate agency that controls water pollution in the Delaware River.[4] The proposed air-pollution compact was modeled after the DRBC and would function similarly, setting minimum air standards across states and enabling enforcement actions against polluters.[84] New York, New Jersey, and Connecticut adopted the proposed Mid-Atlantic States Air Pollution Control Compact[85] with the possibility for Delaware and Pennsylvania to join in the future.[86] Its approval by Congress became a policy goal of Rockefeller's failed primary bid for the 1968 Republican presidential nomination.[87] The compact was never approved by Congress and thus never took effect.[86]

After the 1966 smog, "the consequences of state inaction were apparent to the naked eye," public outcry intensified, and the demand for federal intervention increased.[88] New Jersey passed several new air-pollution laws in 1967.[85] Nevertheless, traffic and drifting polluted air from New Jersey remained a major contributor to New York City's pollution problem.[70] Edward Teller—the physicist known for his role in developing the hydrogen bomb and an advisor to Mayor Lindsay on pollution and energy issues—advocated for New York state to adopt stricter sulfur fuel standards than the city.[89] A leader of the advocacy group Citizens for Cleaner Air criticized the local and state governments at a state public hearing, calling the city's enforcement "in a state of collapse" and, saying the city acting alone "cannot or will not enforce any standard or rule," demanded that the state government increase its role.[70]

Perhaps the most notable critic of New York's inaction was Robert F. Kennedy.[90] On a 1967 tour of pollution sources, Kennedy—then a New York Senator and soon to embark on his 1968 presidential campaign—criticized the city, the states of New York and New Jersey, industry, and the federal government for their failures to adequately address the problem.[90] Kennedy warned, "[w]e are just as close to an air-pollution disaster as we were last Thanksgiving."[90] In Kennedy's view, the solution would have to come from the federal government, as state and local agencies lacked the ability or oversight for the task.[90]

Federal response

Air pollution control, already a priority of President Lyndon B. Johnson's administration,[i] became a greater concern after the smog. By early 1967, his statements on air pollution became more rhetorically urgent.[93] In January 1967, Johnson sent a message to Congress entitled "Protecting Our National Heritage," the first section of which was entitled "The Pollution of Our Air" and focused on the problems posed by air pollution.[60] The message was prompted by wide public discussion of the problem following the 1966 smog.[94] Johnson cited the experiences of specific American cities and towns in the message, and highlighted the 1966 smog at length:

Two months ago, a mass of heavily polluted air—filled with poisons from incinerators, industrial furnaces, power plants, car, bus and truck engines—settled down upon the sixteen million people of Greater New York.

For four days, anyone going out on the streets inhaled chemical compounds that threatened his health. Those who remained inside had little protection from the noxious gases that passed freely through cooling and heating systems.

An estimated 80 persons died.[f] Thousands of men and women already suffering from respiratory diseases lived out the four days in fear and pain.

Finally, the winds came, freeing the mass of air from the weather-trap that had held it so dangerously. The immediate crisis was ended. New Yorkers began to breathe "ordinary" air again.

"Ordinary" air in New York, as in most large cities, is filled with tons of pollutants: carbon monoxide from gasoline, diesel and jet engines, sulfur oxides from factories, apartment houses, and power plants; nitrogen oxides, hydrocarbons and a broad variety of other compounds. These poisons are not so dramatically dangerous most days of the year, as they were last Thanksgiving in New York. But steadily, insidiously, they damage virtually everything that exists.[60]

Refer to caption.
President Johnson signing the Air Quality Act of 1967. The law, a series of amendments to the 1963 Clean Air Act, was enacted in response to the 1966 smog.

Johnson called for a bill regulating toxins in the air and increasing funding for pollution programs.[60][74] Edmund Muskie, a Senator from Maine and political environmentalist, praised Johnson's words, pledged to hold hearings on the proposals,[96] and would soon sponsor the Johnson administration's bill, which became the Air Quality Act.[97] Muskie also co-sponsored bills in 1967 for research on non-polluting automobiles using either electric or fuel cell technology.[98] While discussing the research bills on the Senate floor, Muskie said "the serious air pollution situation in New York City [in November of 1966] dramatically illustrated what our cities may be facing in the future if an alternative to the [internal] combustion engine is not developed."[98]

Congressional interest and public pressure for greater air pollution regulation had existed since the signing of the 1963 Clean Air Act, the first federal legislation on the issue, but further action had been opposed by members of Congress who believed responsibility for air regulation properly lay with the states, not the federal government.[99] Partly in response to the added public pressure spurred by the smog event, Congress passed and Johnson signed the 1967 Air Quality Act, which amended the 1963 Clean Air Act to provide for study of air quality and control methods.[100][101]

The Air Quality Act was a significant advancement in the realm of air-pollution regulation, but one that was ultimately ineffective. In Train v. Natural Resources Defense Counsel, a 1975 decision by the Supreme Court of the United States, Justice William Rehnquist summarized the law's effect as follows:

The focus shifted somewhat in the Air Quality Act of 1967, 81 Stat. 485. It reiterated the premise of the earlier Clean Air Act 'that the prevention and control of air pollution at its source is the primary responsibility of States and local governments.' Its provisions, however, increased the federal role in the prevention of air pollution, by according federal authorities certain powers of supervision and enforcement. But the States generally retained wide latitude to determine both the air quality standards which they would meet and the period of time in which they would do so.

The response of the State to these manifestations of increasing congressional concern with air pollution was disappointing. Even by 1970, state planning and implementation under the Air Quality Act of 1967 had made little progress.[102]

Among contemporaneous critics, John C. Esposito—an environmentalist and affiliate of Ralph Nader—wrote the 1970 book Vanishing Air to accuse Muskie of watering down the bill and adding needless complications to satisfy industry.[103] A 2011 encyclopedia of environmental law article judged that the act "was a failure but it was the first step in federal air pollution control."[101] Calls for greater air pollution regulation in this era culminated with the passage under President Richard Nixon of the 1970 Clean Air Act, which supplanted the Air Quality Act and has been described as the most significant environmental legislation in American history.[99] The 1970 Clean Air Act significantly increased the role of the federal government and, for the first time, imposed air quality requirements on states.[104]

The 1966 smog in cultural memory

Refer to caption.
A plume of smoke rising from lower Manhattan after the September 11 attacks, seen from space. Cumulative air pollution events like the 1966 smog contrast with the sudden pollution that resulted from the September 11 attacks.

The most widely recognized legacy of the 1966 smog was the political reaction to it, which galvanized the nascent environmental movement in the United States and prompted demand for sweeping air-pollution control laws.[63][64][65][66][67] The smog has been remembered for various purposes by scientists, historians, journalists, writers, artists, activists, and political commentators.

The full range of negative health effects arising from the September 11 attacks came to light in the years following the attacks. The 1966 smog serves, along with the earlier major New York City smog events in 1953 and 1963, as a precedent used for comparison with the air effects caused by the collapse of the World Trade Center. The 1966 smog and other historical smog events differ from the September 11 pollution in significant ways that limit their usefulness as a point of comparison. Prior New York City smog events were chronic, cumulative, and caused by thousands of small sources, while the air impact of the September was sudden, intense, and the result of a single culpable source. The absence of prior events similar to the September 11 attacks left "a hole in the medical library," and presented medical experts with a challenge in the absence of "hard knowledge about the health consequences of intense brief pollution."[24]

Other major air pollution, particularly in China, has been compared to the 1966 smog. Elizabeth M. Lynch, a New York City legal scholar, said that images of visible air pollution in Beijing from 2012 were "gross" but not "that much different from pictures of New York City in the 1950s and 1960s", specifically referring to the 1952, 1962,[a] and 1966 smog events.[105] Lynch wrote that the Chinese government's increased transparency on the issue was an encouraging sign that pollution in China could be regulated and abated just as it had in the United States.[105] Similar comparisons between the 1966 smog and Chinese pollution in late 2012 appeared in Business Insider and Slate.[106][107] USA Today cited the 1966 smog after China issued its first "red alert" air quality warning in December 2015;[108] the same month, an article in The Huffington Post used the 1966 smog to argue that China could follow the United States' model to regulate pollution.[109]

External video
"Smog Almost Killed New York City, Here's How" (March 24, 2017) — interview with photographer Arthur Tress and history of air pollution in the United States. Video by Seeker, via YouTube.

The smog event has been referenced in pop culture. Smog figures into the plot of the 2012 Mad Men episode "Dark Shadows", which is set in New York City during the same Thanksgiving weekend in 1966.[110] A reviewer in The A.V. Club interpreted the writers' use of the smog as a symbolic representation of the character Betty, who spends the episode "longing to enter [Don Draper's] apartment and tear some shit up"—"hover[ing]" and "waiting to poison it from within".[111] The New York City-based indie pop band Vampire Weekend used a photograph of the smog over the city skyline, taken by Neal Boenzi and originally published in The New York Times, for the cover of their 2013 album Modern Vampires of the City.[112]

Following the 2016 election of Donald Trump to the presidency, his administration's environmental proposals—including steep budget cuts to the EPA and deregulation—prompted several reflections on the environmental condition of the United States prior to the creation of the EPA. The New York Times,[113] Vice Media's tech-news site Motherboard,[114] public radio station WNYC,[115] real estate news site 6sqft,[116] and environmental advocacy group Natural Resources Defense Council (NRDC)[117] connected Trump's declared policies to the risk of returning to a more polluted environment, with each publication evoking the 1966 smog as an example of the potential dangers of defunding and deregulation. David Hawkins, an attorney for NRDC, recalled, "I was a student at Columbia Law School during the 1966 episode. It was frightening, but while that is the best-known event, heavy pollution was an everyday fact of life those days."[117]

See also


  1. ^ a b Sources differ on the timing of the 1963 smog. It is variously described as occurring in January–February, October, or November, and it is possible that minor smog events occurred during those months. January–February is most likely to be the correct time for that year's most significant smog event, because it is the period Dr. Leonard Greenburg identified in his study of significant excess deaths caused by smog.[21] The 1963 smog is sometimes inaccurately described as occurring in 1962; other sources list a 1962 smog as a fourth major New York City smog, alongside the smogs of 1953, 1963, and 1966. There was a smog event in November 1962, but Greenburg's studies found it had not resulted in significant excess deaths.[22]
  2. ^ a b The term "excess deaths," or mortality displacement, refers to a statistically significant, temporary increase above the expected mortality rate in a given population over a given period of time. In Greenburg's studies on mortality during New York City smog events, the method to measure excess deaths was to compare the expected number of deaths and the actual number of deaths for a particular period. Where the actual number of deaths significantly exceeds the expected number, it can be inferred that a major event that occurred at the same time (such as a heat wave or, in this case, a smog event) caused or contributed to the excess deaths.
  3. ^ Another spokesperson for the city clarified Heller's comments to the press, noting that the required pollution levels for a first-stage alert were not reached at any time that morning and the Weather Bureau's forecast at the time had predicted the inversion would pass in only 24 hours, not the 36 hours required to trigger an alert. Heller, said the decision had been a "very, very close" one.[1]
  4. ^ Mayor Lindsay returned from his four-day vacation on the evening of November 27. When asked for comment about the smog he had missed, Lindsay replied "I thought I took all the bad weather with me to Bermuda. It rained there more than half the time."[52]
  5. ^ Another smog-related story was reported in New Bedford, Massachusetts. Visibility there reportedly became so bad that two burglaries, one at a jewelry store and another at a liquor store, were said to have exploited the thick smog throughout the city as cover. After the burglaries, police officers patrolled businesses door-to-door that day.[54]
  6. ^ a b Johnson's source for a death toll of 80 is not clear, but the figure is sometimes repeated (see, for example, its use in Bernstein 1996, p. 294, a biography of Johnson), even after the publication of more-reliable scientific medical papers on the subject. Legal scholar Arnold W. Reitze, who used Greenburg's figure in a scholarly law review article, noticed the discrepancy among sources. Reitze noted "fatality figures concerning episodes are based on statistical techniques and vary among data reporting sources."[95]
  7. ^ The term "white flight" refers to the migration of middle-class, white residents from urban areas to the surrounding suburbs.
  8. ^ In American law, an interstate compact is an agreement between two or more states, often to create a new regional governmental agency. Article I, Section 10 of the Constitution requires the approval of Congress before any interstate compact can take effect.
  9. ^ Johnson signed legislation in 1965 to establish new standards for automobiles by 1967.[91] In May 1966, Johnson signed an executive order that directed the heads of all federal agencies to plan the installation of air pollution controls at federal facilities.[92] Joe Califano, Johnson's Secretary of Health, Education, and Welfare, organized a task force in 1966 to prepare a report for the 90th Congress on issues of environmental concern, primarily air pollution. The task force's report was published November 21, 1963—just days before the New York City smog.[56]



  1. ^ a b c d e f g h i j k l m "Smog Here Nears Danger Point; Patients Warned", The New York Times, November 25, 1966
  2. ^ a b c d e f Popkin 1986, p. 28
  3. ^ a b c d e f Popkin 1986, p. 27
  4. ^ a b c d e f Bird, David (October 27, 1967), "November Smog Killed 168 Here", The New York Times
  5. ^ a b c d Goklany 1999, p. 24
  6. ^ a b c d Wise 1968, p. 176
  7. ^ a b c Kuttler 1979, p. 236
  8. ^ Kuttler 1979, p. 237
  9. ^ a b New York Academy of Medicine Committee on Public Health 1966, p. 590: "British studies support the view that pollution in [London and its surrounding area] is attributable overwhelmingly to the combustion of coal and oil, which contain compounds of sulfur as impurities in varying degrees. Smoke and sulfur dioxide are now measured routinely in London and are used as indices of pollution. It is important for New Yorkers to recognize that these two pollutants are present in roughly the same amounts in London and New York.
  10. ^ Kuttler 1979, p. 238
  11. ^ New York Academy of Medicine Committee on Public Health 1966, p. 606: "In contrast to the composition of pollution in London, the type in Los Angeles contains little coal smoke, fog, or sulfur dioxide. Auto exhaust gases are the principal source of pollution. Photochemical reactions between volatile organic compounds, especially olefinic hydrocarbons, and the exhaust of nitrogen produce highly reactive peroxy-compounds and ozone.
  12. ^ a b c Loory, Stuart H. (November 26, 1966), "'Conspiracy' of Nature's Forces Is Blamed for Smog", The New York Times
  13. ^ Goklany 1999, p. 27
  14. ^ a b Freeman 2005, p. 175
  15. ^ Fensterstock & Fankhauser 1968, p. 35
  16. ^ Wise 1968, pp. 12–15
  17. ^ a b c Iglauer, Edith (April 13, 1968), "The Ambient Air", The New Yorker, The New Yorker Magazine, Inc.
  18. ^ Goklany 1999, pp. 24–25: "[A] series of air pollution episodes occurred in which excess deaths and sicknesses were noted and covered almost immediately by newspapers"; Goklany further argues that economic modernization and the development of the consumer economy led to more frequent detection of smog episodes: "increasing affluence made the general public more desirous of a better quality of life and less tolerant of pollution."
  19. ^ a b c d e f g h i j Kihss, Peter (May 10, 1963), "Air Study Finds Pollution Here Worst in Nation", The New York Times
  20. ^ a b c "Our Air and Water Can Be Made Clean", Life, vol. 61 no. 7, p. 4, August 12, 1966
  21. ^ a b c McCarroll 1967, p. 206
  22. ^ McCarroll 1967, p. 205
  23. ^ McCarroll 1967, p. 204
  24. ^ a b Johnson, Kirk (September 29, 2002), "You Should Have Seen the Air in '53; After Sept. 11, Considering History's Lessons on Pollution", The New York Times, archived from the original on May 27, 2015 Unknown parameter |dead-url= ignored (help)
  25. ^ a b c Karapin 2016, p. 171
  26. ^ a b c d e f g h Schumach, Murray (November 27, 1966), "Smog Swept Away By Cool Air Mass; Emergency Ended", The New York Times
  27. ^ a b "Man in the News: City's Smog Measurer Moe Mordecai Braverman", The New York Times, November 26, 1966
  28. ^ a b c d e f g Reeves, Richard (November 26, 1966), "Emergency Antipollution Techniques Used in Alert", The New York Times
  29. ^ a b c d e Kaplan, Morris (November 27, 1966), "Regional Agency Fights Pollution", The New York Times
  30. ^ Peterson, Russell W., "Foreword", p. iv in Thom & Ott 1975
  31. ^ Sanderson 1977, p. 43
  32. ^ Freedom to Breathe: Report of the Mayor's Task Force on Air Pollution in the City of New York (June 20, 1966), p. 126
  33. ^ Sanderson 1977, p. 43–44
  34. ^ Freedom to Breathe: Report of the Mayor's Task Force on Air Pollution in the City of New York (June 20, 1966), p. 127
  35. ^ a b c Bird, David (November 1, 1968), "City Begins Monitoring 3 Kinds of Air Pollutants", The New York Times
  36. ^ Sanderson 1977, p. 44
  37. ^ "East Coast Smog May Get Heavier", The New York Times, September 6, 1963
  38. ^ Wise 1968, pp. 14–15
  39. ^ Wise 1968, p. 15
  40. ^ Wise 1968, p. 15 (internal ellipses omitted from quotation)
  41. ^ New York Academy of Medicine Committee on Public Health 1966, p. 594
  42. ^ New York Academy of Medicine Committee on Public Health 1966, pp. 613–614
  43. ^ a b c d Anderson 1999, p. 472
  44. ^ Fensterstock & Fankhauser 1968, p. 3
  45. ^ a b Sullivan, Walter (November 27, 1966), "The Whys Of Smog Sulfur Problem", The New York Times
  46. ^ Fensterstock & Fankhauser 1968, p. 7
  47. ^ Fensterstock & Fankhauser 1968, p. 1
  48. ^ Fensterstock & Fankhauser 1968, pp. 5–12, image adapted from figures 2B, 3B, 4B, 6B, 7B, and 8B.
  49. ^ Wise 1968, p. 14
  50. ^ a b c d e f g h i j Stradling 2010, p. 207
  51. ^ a b c d e f g h i j k l m n o p Bigart, Homer (November 26, 1966), "Smog Emergency Called for City", The New York Times
  52. ^ "Mayor Missed the Smog, But Bermuda Was Wet", The New York Times, November 28, 1966
  53. ^ "Rain Washes Down Smog Peril in N.Y.", Chicago Tribune, November 26, 1966, archived from the original on September 12, 2016 Unknown parameter |dead-url= ignored (help)
  54. ^ a b "Air Pollution Poses Peril on Seaboard", The Desert Sun (running a United Press International wire story), November 25, 1966, archived from the original on September 8, 2017 – via The California Digital Newspaper Collection at the University of California, Riverside Unknown parameter |dead-url= ignored (help); Italic or bold markup not allowed in: |newspaper= (help)
  55. ^ Esposito 1970, p. 204 (cited by Bernstein 1996, p. 294)
  56. ^ a b Bernstein 1996, p. 294
  57. ^ a b c Brody, Jane E. (November 26, 1966), "Millions Plagued by Air Irritants", The New York Times
  58. ^ a b c Reeves, Richard (November 29, 1966), "Hospitals Report Public Unharmed By 3 Days of Smog", The New York Times
  59. ^ a b "10% Here Suffered Effects of Smog, Private Study Finds", The New York Times, December 10, 1966
  60. ^ a b c d Johnson, Lyndon B. (January 30, 1967), 20 – Special Message to the Congress: Protecting Our Natural Heritage, Public Papers of the Presidents of the United States, Washington, D.C.: United States Government Publishing Office, archived from the original on September 12, 2016 – via The American Presidency Project at University of California, Santa Barbara Unknown parameter |dead-url= ignored (help)
  61. ^ a b c Alden, Robert (November 26, 1966), "1948 Donora Smog Killed 20; London Toll Was 4,000 in '52", The New York Times
  62. ^ a b c d e f g h i j k Popkin 1986, p. 29
  63. ^ a b Benton-Short & Short 2008, p. 39
  64. ^ a b Harper 2016, p. 229
  65. ^ a b Horowitz 2005, pp. 189–190
  66. ^ a b Reitze 1999, p. 699
  67. ^ a b c Podhora 2015, pp. 24–25
  68. ^ Wise 1968, p. 177
  69. ^ a b Weart, Spencer R. (February 2014), The Discovery of Global Warming: The Public and Climate Change, American Institute of Physics, archived from the original on July 30, 2016 Unknown parameter |dead-url= ignored (help)
  70. ^ a b c d e f g h Millones, Peter; Schumach, Murray (June 4, 1969), "The Changing City: Tide of Pollution", The New York Times
  71. ^ a b c Karapin 2016, p. 172
  72. ^ a b Sieckhaus 2009, p. 72
  73. ^ a b c Sibley, John (November 28, 1966), "New Smog Plans Sought for City", The New York Times
  74. ^ a b Weisbrot & Mackenzie 2008, p. 214
  75. ^ Thomas, Ryland; Williamson, Samuel H. (2019). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved April 6, 2019. United States Gross Domestic Product deflator figures follow the Measuring Worth series.
  76. ^ "City Buys System to Check on Air", The New York Times, April 24, 1967
  77. ^ Cohen et al. 1971, pp. 542–543
  78. ^ "Air Is Cleared in City as Polluted Mass Goes", The New York Times, August 19, 1967
  79. ^ Bird, David (July 31, 1970), "Pollution Alert Continues With Relaxation of Curbs", The New York Times
  80. ^ Freeman 2005, pp. 175–176
  81. ^ Goklany 1999, p. 26; see also Goklany 1999, p. 22, Figure 1–3 (a bar graph showing the number of municipal, county, and state air-pollution programs from 1880–1980)
  82. ^ a b c Goklany 1999, p. 26
  83. ^ a b c "4 States in Drive on Air Pollution", The New York Times, December 18, 1966
  84. ^ Bird, David (May 10, 1967), "Pollution Report Issues a Warning", The New York Times
  85. ^ a b Sullivan, Ronald (June 16, 1967), "Hughes Signs Bill Including Jersey in Clean-Air Pact", The New York Times
  86. ^ a b Edelman 1968, p. 565
  87. ^ "Rockefeller Urges Pollution Program", The New York Times, July 15, 1968
  88. ^ Goklany 1999, pp. 175–176
  89. ^ Bird, David (September 14, 1967), "Teller Backs New Smog Curbs As a Source of Broad Benefits", The New York Times
  90. ^ a b c d Bird, David (June 20, 1967), "Kennedy Warns of Air Pollution 'Disaster'", The New York Times
  91. ^ Bernstein 1996, p. 293
  92. ^ Bailey 1998, p. 120
  93. ^ Blomquist 2004, p. 599
  94. ^ Reitze 1999, p. 700
  95. ^ Reitze 1999, p. 699, see footnote 155
  96. ^ Frankel, Max (January 31, 1967), "President Urges National Attack on Air Pollution", The New York Times
  97. ^ Reed, Roy (November 22, 1967), "President Signs Air Quality Act", The New York Times
  98. ^ a b Blomquist 2004, pp. 610–611
  99. ^ a b Bailey 1998, p. 119
  100. ^ Bailey 1998, p. 125
  101. ^ a b Barnhill 2011, p. 66
  102. ^ Train v. Natural Resources Defense Council, Inc., 421 U.S. 60, 64 (1975).
  103. ^ Esposito 1970, pp. 270, 273; see also Marcello 2004, pp. 51–52
  104. ^ See Train v. NRDC, 421 U.S. at 64–65.
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Journal articles

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Kuttler, Wilhelm (1979). "London-Smog und Los Angeles-Smog". Erdkunde, Archiv für wissenschaftliche Geographie (in German and English). University of Bonn. 33 (3): 236–240. doi:10.3112/erdkunde.1979.03.07.
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