Emissions of air pollutants, United States, 1970

Annual emissions of various air pollutants, indexed to emission levels in the first year of data. Values in 1970 or1990 are normalised to 100; values below 100 therefore indicate a decline in emissions. Volatile organic compounds(VOCs) do not include methane emissions.

100100100100Sulphur dioxide (SO₂)Nitrogen oxides (NOx)Volatile organic compounds (VOCs)PM₁₀

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Emissions of air pollutants

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