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The 2018 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 2700 towns and cities in 91 countries. Air quality in the database is represented by the annual mean concentration of particulate matter ( PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 micrometers, respectively).
In 2024, the Los Angeles-Long Beach-Riverside area ranked the 1st most ozone-polluted city, the 6th most polluted city by annual particle pollution, and the 11th most polluted city by 24-hour particle pollution. [3] Both ozone and particle pollution are dangerous to human health.
The Central Valley is one of the top 10 most polluted cities in the United States, according to the American Lung Association’s 2024 State of the Air report. Each year, the association issues ...
Las Vegas was the cleanest major city in the U.S. For the first time in the history of this report, Canada was the most polluted country in Northern America, with the region's 13 most polluted ...
The Harvard "Six Cities" study was a major epidemiological study of over 8,000 adults in six American cities that helped to establish the connection between fine-particulate air pollution (such as diesel engine soot) and reduced life expectancy ("excess mortality"). [1] Widely acknowledged as a landmark piece of public health research, [2][3][4 ...
Cincinnati ranks 22nd worst U.S. city for particle pollution, and Hamilton County is the worst in Ohio, an American Lung Association report shows Cincinnati ranks among 25 most polluted cities in ...
50 states and Washington, D.C. This table lists the 336 incorporated places in the United States, excluding the U.S. territories, with a population of at least 100,000 as of July 1, 2023, as estimated by the U.S. Census Bureau. Five states have no cities with populations exceeding 100,000. They are: Delaware, Maine, Vermont, West Virginia, and ...
Here are the top 10 most polluted metropolitan areas in the United States in terms of ozone, according to the American Lung Association: Los Angeles-Long Beach. Visalia. Bakersfield. Fresno-Madera ...