EPA finalized the residual risk and technology review conducted for the mercury cell chlor-alkali plants source category regulated under NESHAP; these final amendments prohibit mercury emissions from existing mercury cell chlor-alkali plants based on the results of the Agency's technology review and beyond-the-floor maximum achievable control technology determination. 

EPA announced the results of its residual risk and technology review and proposed new emissions standards for the major source primary copper smelters NESHAP under the CAA. 

EPA finalized the residual risk and technology review for the refractory products manufacturing source category regulated under NESHAP; the Agency is making no revisions to the emission limits for this source category. 

EPA finalized the residual risk and technology reviews conducted for the carbon black production and cyanide chemicals manufacturing major source categories and the technology review conducted for the carbon black production area sources, regulated under NESHAP; the Agency finalized new emissions standards and amendments for both source categories. 

EPA announced the availability of the residual risk and technology review and the finalization of proposed revisions for the flexible polyurethane foam fabrication operation major source NESHAP. 

Based on the results of EPA's residual risk and technology review for NESHAPs for cyanide chemicals manufacturing, the Agency proposed to amend provisions addressing startup, shutdown, and malfunctioning, add electronic reporting, and update the reporting and recordkeeping requirements to improve monitoring, compliance, and implementation of the existing standards, which the Agency found to provide an ample margin of safety to protect public health.

EPA proposed to amend NESHAPs for the carbon black production major source category to address the results of its residual risk and technology review; the amendments address hazardous air pollutant emissions and startup, shutdown, and malfunction provisions, and would require electronic reporting of certain information.

EPA proposed the results of its residual risk and technology review of NESHAPs for primary magnesium refining, finding that risks from emissions of air toxics from this source category are acceptable and that after removing the exemptions from startup, shutdown, and malfunction, the standards provide an ample margin of safety.

EPA proposed the results of its residual risk and technology review of NESHAPs for mercury emissions from mercury cell chlor-alkali plants, finding risks due to emissions of hazardous air pollutants to be acceptable from the source category and determining that no more stringent standards are necessary.

EPA finalized the residual risk and technology review for NESHAPs for the major source iron and steel foundries source category and the technology review for the area source iron and steel foundries source category; the Agency also removed some exemptions for emissions standards and amended reporting requirements.