ABSTRACT
This chapter considers four of the major gaseous air pollutants: sulfur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and carbon monoxide (CO). The importance of these gaseous air pollutants is emphasized by the fact that they are four of the six “Criteria Air Pollutants” regulated by the U.S. Environmental Protection Agency (EPA). The other two criteria air pollutants are volatile organic compounds (VOCs) and lead (Pb). VOCs are discussed in Chapter 11, while Pb is included in Chapter 12.
