Proposed rule · 2026-21383

New Source Performance Standards and National Emission Standards for Hazardous Air Pollutants; Delegation of Authority to Northwest Clean Air Agency, Washington State

The Northwest Clean Air Agency (NWCAA), located in Washington State, submitted updated regulations for receiving delegation and approval of its program for the implementation and enforcement of newly issued or revised New Source Performance Standards (NSPS) and National Emission Standards for Hazardous Air Pollutants (NESHAP), as provided for under previously approved delegation mechanisms. The updated regulations incorporate by reference certain NSPS and NESHAP promulgated by the Environmental Protection Agency (EPA) as they existed through October 18, 2023. The EPA is providing notice that it is proposing to update the delegation of certain NSPS and approve the delegation of certain NESHAP to NWCAA. The proposed delegation of authority under this action does not apply to sources located in Indian country.