The Environmental Protection Agency (EPA) is finalizing amendments to the new source performance standards (NSPS) for secondary lead smelters pursuant to the periodic review required by the Clean Air Act (CAA). Specifically, the EPA is finalizing revisions to the NSPS that applies to affected secondary lead smelters constructed, reconstructed, or modified after December 1, 2022 (NSPS subpart La). The EPA is also finalizing amendments to the NSPS for secondary lead smelters constructed, reconstructed, or modified after June 11, 1973, and on or before December 1, 2022, (NSPS subpart L). In addition, we are finalizing the use of EPA Method 22 (Visual Determination of Fugitive Emissions from Material Sources and Smoke Emissions from Flares) as an alternative for demonstrating compliance with the opacity limit.