Where does vehicular air pollution come from?

Motor vehicles play a major role in air pollution. They are the single largest contributor of the precursors of ground-level ozone, which is a major urban pollutant. Motor vehicles also contribute significantly to particulate matter (PM) pollution. Both kinds of pollution stem from burning fossil fuels and vehicle use, and both contribute to cardiovascular and respiratory problems.

Here's the Science

Motor vehicles generate three major pollutants: hydrocarbons, nitrogen oxides and carbon monoxide. Hydrocarbons react with nitrogen oxides in the presence of sunlight (ultraviolet radiation) to form ground-level ozone. Elevated ozone levels mainly occur during the months of May through September. Nitrogen oxides also help form acid rain. Carbon monoxide, a colorless, odorless, deadly gas, can impair mental and visual functions and have other negative effects at high levels of exposure.

To read the rest of this article from Clean Air NY, click here.