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U.S. air pollutant emissions 1990-2019, by type

Air pollutant emissions in the United States have been declining since 1990. In that year, nitrogen oxide emissions amounted to 25.2 million tons. By 2019, levels had fallen by 65 percent. Nitrogen oxides such as nitrogen dioxide are harmful to humans, as are particulate matter emissions. PM2.5 levels dropped to their lowest level in 2019, at 1.5 million tons. The number of air pollution related deaths in the U.S. amounted to more than 100,000 in 2017.

Air pollutant emissions in the United States from 1990 to 2019, by pollutant (in 1,000 tons)*

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Release date

May 2020


United States

Survey time period

1990 to 2019

Supplementary notes

*Figures for NH3 pre-2002 includes wildfires; PM emissions also exclude miscellaneous emissions.

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Statistics on "Pollution in the U.S. "

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