National Emission Standards for Hazardous Air Pollutants; Proposed Standards for Hazardous Air Pollutants Emissions for the Portland Cement Manufacturing Industry

This action proposes national emission standards for hazardous air pollutants (NESHAP) for new and existing sources in portland cement manufacturing plants. Exposure to the hazardous air pollutants (HAPs) in these emissions may be associated with a wide variety of effects, including carcinogenic, respiratory, nervous system, dermal, developmental, and/or reproductive health effects. Implementation of the proposed requirements would reduce emissions of several HAPs. The standards are proposed under the authority of section 112(d) of the Clean Air Act as amended (the Act) and are based on the Administrator's determination that portland cement manufacturing plants may reasonably be anticipated to emit several of the HAPs listed in section 112(b) of the Act from the various process operations found within the industry. The proposed NESHAP would provide protection to the public by requiring all portland cement plants which are major sources to meet emission standards reflecting the application of the maximum achievable control technology (MACT).