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This action will address the agency’s review of the New Source Performance Standards (NSPS) for Secondary Lead Smelting (subpart L). The Secondary Lead Smelting NSPS was promulgated pursuant to section 111(b) of the Clean Air Act (CAA) on October 6, 1975. The NSPS established standards of performance in the form of emission limitations for particulate matter (PM) and opacity limits based on the best system of emission reductions (BSER) (taking into account the cost of achieving such reduction and any non-air quality health and environmental impact and energy requirements). This action will implement the review requirements of CAA section 111(b)(1)(B). CAA section 111(b)(1)(B) requires the EPA to review, and if appropriate, revise the standards of performance based on the BSER, no less often than every 8 years. Pursuant to the Our Children’s Earth consent decree, the EPA is obligated to propose this action by November 17, 2022, and finalize this action by November 16, 2023.