National Emission Standards for Hazardous Air Pollutants: Mercury Cell Chlor-Alkali Plants, Primary Magnesium Refining, Flexible Polyurethane Foam Fabrication Operations, Refractory Products Manufacturing, Carbon Black Production, and Cyanide Chemicals Ma
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The U.S. Environmental Protection Agency (EPA) is exending comment periods for proposed rules titled ``National Emission Standards for Hazardous Air Pollutants: Mercury Cell Chlor-Alkali Plants Residual Risk and Technology Review'' and ``National Emission Standards for Hazardous Air Pollutants: Primary Magesium Refining Residual Risk and Technology Review,'' published on January 8, 2021, ``National Emission Standards for Hazardous Air Pollutants: Flexible Foam Fabrication Operations Residual Risk and Technology Review and Flexible Polyurethane Foam Production and Fabrication Area Source Technology Review,'' published on January 11, 2021, ``National Emission Standards for Hazardous Air Pollutants: Refractory Products Manufacturing Residual Risk and Technology Review'' and ``National Emission Standards for Hazardous Air Pollutants: Carbon Black Production Residual Risk and Technology Review,'' published January 14, 2021, and ``National Emission Standards for Hazardous Air Pollutants: Cyanide Chemicals Manufacturing Residual Risk and Technology Review,'' published on January 15, 2021, to allow additional time for stakeholders to review and comment on the proposals.