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DOE: highway vehicles responsible for a declining share of pollutants

Highway vehicles are responsible for a declining share of pollutants in the US, according to data gathered by the US Department of Energy (DOE).

  • More than 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.



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