The EPA has promulgated national emission standards for hazardous air pollutants (NESHAP) for stationary reciprocating internal combustion engines (RICE) with a site-rating of more than 500 brake horsepower (HP). The EPA proposed the NESHAP for stationary RICE on December 19, 2002, and received 64 comment letters on the proposal. A background information document (BID) (“National Emission Standards for Stationary Reciprocating Internal Combustion Engines, Summary of Public Comments and Responses,”) containing EPA’s responses to each public comment is available in Docket ID Nos. OAR-2002-0059 and A-95-35. RICE are major sources of hazardous air pollutants (HAP) emissions such as formaldehyde, acrolein, methanol, and acetaldehyde. This NESHAP will implement section 112(d) of the Clean Air Act (CAA) by requiring all major sources to meet HAP emission standards reflecting the application of the maximum achievable control technology (MACT) for RICE.
Approximately 40 percent of stationary RICE are located at major sources and thus, subject to the final rule. The final rule will protect public health by reducing exposure to air pollution, by reducing total national HAP emissions by an estimated 5,600 tons per year (tpy) in the 5th year after the rule is promulgated. The emissions reductions achieved by these standards will provide protection to the public and achieve a primary goal of the CAA. The final rule is effective August 16, 2004.