There are four major pollutants that come from cars:
A car emits carbon monoxide when the carbon in fuel doesn't burn completely.
A car's exhaust emits hydrocarbons, a toxic compound of hydrogen and carbon.
When fuel burns, nitrogen and oxygen react with each other and form nitrogen oxides (NOx).
Particulate matter -- small particles of foreign substances -- in the air contribute to atmospheric haze and can damage people’s lungs.

Pollutants from cars contribute to various types of air pollution....

Continue reading ...