Automobile Emissions: Primary Health Effects Concerns

Mobile sources contribute to air pollution both directly and indirectly through emission of precursors to photochemical reactions. Numerous pollutants are emitted including those regulated by National Ambient Air Quality Standards (ozone, nitrogen oxides, particulate matter such as sulfuric acid, carbon monoxide, and lead) as well as others that are not regulated. These pollutants are known to cause a variety of health effects, and the effects of highest concern are to be discussed along with mention of key uncertainties.