Revision of Source Category List for Standards Under Section 112(k) of the Clean Air Act; and National Emission Standards for Hazardous Air Pollutants for Area Sources: Ferroalloys Production Facilities

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EPA is revising the area source category list by changing the name of the ferroalloys production category to clarify that it includes all types of ferroalloys. We are also adding two additional products (calcium carbide and silicon metal) to the source category. EPA is issuing final national emissions standards for control of hazardous air pollutants (HAP) for area source ferroalloys production facilities. The final emissions standards for new and existing sources reflect EPA's determination regarding the generally available control technology (GACT) or management practices for the source category.