In the 1990 Clean Air Act (CAA), Congress included provisions to reduce emissions of hazardous air pollutants (HAPs) considered to pose a risk to human health and the environment. The U.S. Environmental Protection Agency (EPA) defined a schedule for developing air toxic regulations for various source categories, including a target promulgation date of 2000 for stationary internal combustion (IC) engines. To assist the gas industry to respond to these and other upcoming federal and state regulatory requirements, the Gas Research Institute (GRI) is investigating air toxic emissions from natural gas industry sources. Based on the results of Phase I of this research, IC engines have been identified as a high priority source, due to the potential for emissions of formaldehyde. This paper summarizes the results from GRI's ongoing effort to evaluate HAP emissions from IC engines, including the new measurement method developed to measure formaldehyde.

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