EPA is considering regulating the emissions of hazardous air pollutants (HAPs) released from coal-burning electric generating units in the United States (U.S. EGUs) under Section 112(n)(1)(A) of the Clean Air Act (CAA). This regulation may potentially use a Maximally Achievable Control Device (MACT) approach to set a technology-based standard for reducing HAP emissions.
EPA is developing a draft risk assessment for mercury, entitled Technical Support Document: National-scale Mercury Risk Assessment. This draft assessment considers the nature and magnitude of the potential risk to public health posed by current U.S. EGU mercury emissions and the nature and magnitude of the potential risk posed by U.S. EGU mercury emissions in the future, once all anticipated CAA-related regulations potentially reducing mercury from U.S. EGUs are in-place. EPA’s Office of Air and Radiation has requested peer review of this draft document.