This portal helps users quickly locate EPA’s active guidance documents on topics of interest. Guidance documents include memorandums, policy statements, handbooks and manuals, as well as documents formally titled as guidance. Learn about the New Source Performance Standards (NSPS) for commercial and industrial solid waste incineration (CISWI) units including emission guidelines and compliance times for the rule. EPA’s 2025 updates reduce regulatory burdens for small incinerators while tightening emission limits and expanding monitoring requirements. Incineration facilities vary widely in technology, capacity, and controls, with federal standards providing minimum requirements. downloads.regulations.gov On June 30, 2025, the U.S. Environmental Protection Agency (U.S. EPA) announced multiple final amendments to the Other Solid Waste Incinerators (OSWI) standards based on its review of 40 CFR Part 60, Subparts EEEE and FFFF required by Clean Air Act (CAA) section 129 (a) (5). The EPA promulgated emission guidelines for existing OSWI units in 2005 and revised them on June 30, 2025. In this proposal, EPA is proposing a federal plan to adopt the 2025 revised standards for any states and tribal lands that do not have plans in place. EPA's Transportation and Air Quality Document Index System (DIS) is a document database for finding regulatory, compliance, and general documents related to mobile sources, air pollution, vehicles, engines, fuels, emissions, and transportation.