Fact #998, October 9, 2017: Highway Vehicles Responsible for a Declining Share of Pollutants

October 9, 2017

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Over half of all carbon monoxide (CO) emissions in 2002 were from highway vehicles; by 2016 that fell to 30%. The share of nitrogen oxides (NOx) emissions from highway vehicles declined from 43% of all NOx emissions in 2002 to 34% in 2016. The highway share of volatile organic compound (VOC) emissions declined by 9% during this same period. Highway vehicles contributed less than 3% of all particulate matter (PM) emissions.

Highway Share of All Pollutant Emissions, 2002-2016

Graphics showing highway share of all pollutant emissions (CO, NOx, PM, and VOC) from 2001 to 2016

Note: Particulate matter emissions include both fine particle matter less than 10 microns (PM-10) and fine particle matter less than 2.5 microns (PM-2.5).

Source: U.S. Environmental Protection Agency, National Emissions Inventory and Air Pollutant Emissions Trends Data.

Fact #998 Dataset

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