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Looking down from the Hollywood Hills, with Griffith Observatory on the hill in the foreground, air pollution is visible in downtown Los Angeles on a late afternoon.. Air pollution is the introduction of chemicals, particulate matter, or biological materials into the atmosphere that cause harm or discomfort to humans or other living organisms, or damage ecosystems.
Air pollution is caused predominantly by burning fossil fuels, cars, and much more. [4] Natural sources of air pollution include forest fires, volcanic eruptions, wind erosion, pollen dispersal, evaporation of organic compounds, and natural radioactivity. These natural sources of pollution often soon disperse and thin settling near their locale.
United States Greenhouse emission of gas from 1990 - 2016 US emissions of CO 2 and methane, 2018 Since 1850, the United States has cumulatively contributed the greatest amount of greenhouse gases of any nation or region. [16] Since 1850, the United States has cumulatively contributed the greatest amount of CO 2 of any nation. [17
Greenhouse gas emissions in the United States (16 P) N. Air pollution in New York City (15 P) ... Air pollution in the United States; 0–9. 1939 St. Louis smog; A.
Anthropogenic air pollution has affected the United States since the beginning of the Industrial Revolution. [ 75 ] According to a 2024 report: "39% of people living in America—131.2 million people—still live in places with failing grades for unhealthy levels of ozone or particle pollution."
To promote pollution prevention, the United States Congress passed the Pollution Prevention Act of 1990. [7] Congress declared that pollution should be prevented and reduced wherever possible; in addition, any waste that must be released into the environment must be done in a responsible, environmentally-conscious manner.
US counties that are designated "nonattainment" for the Clean Air Act's NAAQS, as of September 30, 2017. The U.S. National Ambient Air Quality Standards (NAAQS, pronounced / ˈ n æ k s / naks) are limits on atmospheric concentration of six pollutants that cause smog, acid rain, and other health hazards. [1]
The United States Environmental Protection Agency (EPA) began regulating greenhouse gases (GHGs) under the Clean Air Act ("CAA" or "Act") from mobile and stationary sources of air pollution for the first time on January 2, 2011. Standards for mobile sources have been established pursuant to Section 202 of the CAA, and GHGs from stationary ...