Nitrogen oxide (NOx: mainly NO, NO2)
Source: lean combustion - too little gasoline or too much air.
Environmental Effects:
NO2 is an component of acid rain can damage trees and lakes.
NOX reacts with other chemicals in sunlight to produce ozone smog (brownish haze)
Health Effects: Lung damage, Illnesses such as asthma, bronchitis, and emphysema.
(sicknesses caused by problems with breathing passages and lungs)