"Air toxics" or "hazardous air pollutants" is the designation given in the US Clean Air Act Amendments of 1990 to designate pollutants such as benzene, dioxin, trichloroethylene, etc. Toxics essentially include all air pollutants other than the "criteria" pollutants, i.e., NOx, SOx, CO, Pb, PM and O3 that are regulated by the National Ambient Air Quality Standards, and greenhouse gases.
Air toxics are controlled by federal regulations using a source-based and risk-based approach.
Urban air quality monitoring. Dr. Batterman serves as an advisor to the air toxics monitoring and assessment program for Detroit, Michigan. | ![]() |
Commuting exposure. A study evaluated VOC exposures received by commuters, and compared those levels to results of fixed monitoring. Based on monitoring along three important routes in urban, commercial and industrial sections of Detroit (see map at right), concentrations of several toxics (e.g., benzene) greatly exceeded levels at fixed sites as well as risk-based levels. This isn't surprising given the significance of motor vehicle emissions in urban areas. | ![]() |
Measurement, exposure assessment, and characterization of air toxics are critical factors for risk assessment, the next page in this overview.