Abstract
In the 1970s, the U.S. Environmental Protection Agency (EPA) used the traditional “control with enforcement” method in addressing exposures of the U.S. urban population to carbon monoxide, nitrogen dioxide, sulfur dioxide, ozone, lead, and particles. A different approach will be used to implement the hazardous air pollutant regulations required by the Clean Air Act Amendments of 1990. This article discusses the two approaches and then describes five emerging issues: aerosol acidity, enhanced ozone monitoring, development of simple-to-operate and inexpensive air pollutant monitoring systems, indoor air pollution, and continuous measurement of stack gas flow rate. The areas in which suppliers of pollutant control systems and pollutant measurement systems can help EPA address these issues are also discussed. Mitchell, W.J.: U.S. Standards for Air Sampling of Environmental Contaminants: Current Basis and Future Options. Appl. Occup. Environ. Hyg. 8(4):239-242; 1993.