Pursuant to the U.S. Environmental Protection Agency's Significant New Alternatives Policy program, the Agency is proposing, as an additional option, to list for a limited period of time certain substances in the foamblowing sector, extruded polystyrene: Boardstock and billet end-use, as acceptable, subject to narrowed use limits. This proposal supplements the Agency's June 12, 2020, proposal with respect to the proposed listings in the foam-blowing sector, taking into consideration public comments and information received since issuance of the initial proposal.

The Environmental Protection Agency is issuing regulations to implement certain provisions of the American Innovation and Manufacturing Act, as enacted on December 27, 2020. This Act mandates the phasedown of hydrofluorocarbons, which are highly potent greenhouse gases, by 85 percent over a period ending in 2036.

The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Maricopa County Air Quality Department's (MCAQD) Rule 510 as part of the Arizona State Implementation Plan (SIP). These rule revisions concern updates to the maximum levels of ambient air pollution for the protection of public health and welfare. We are finalizing our proposed approval of this rule to regulate ambient air emissions under the Clean Air Act (CAA or the Act).

The Environmental Protection Agency (EPA) is approving changes to the Kentucky State Implementation Plan (SIP) and the Kentucky Title V Operating Permit Program (Title V) submitted by the Commonwealth of Kentucky, through the Energy and Environment Cabinet (Cabinet) on August 12, 2020, and March 29, 2021.