Under the Clean Air Act, the Environmental Protection Agency (EPA) is required to determine the applicable volume requirements for the Renewable Fuel Standard (RFS) for years after those specified in the statute. This action proposes the applicable volumes and percentage standards for 2023 through 2025 for cellulosic biofuel, biomass-based diesel, advanced biofuel, and total renewable fuel. This action also proposes the second supplemental standard addressing the remand of the 2016 standard-setting rulemaking.

In this final action, the Environmental Protection Agency (EPA) is amending its reformulated gasoline (RFG) regulations to reflect that York, Cumberland, Androscoggin, Sagadahoc, Kennebec, Knox and Lincoln counties in Maine (the Southern Maine Area) are no longer Federal RFG covered areas as of September 30, 2021. EPA previously approved a petition from Maine to opt out of the Federal RFG program and removed the requirement to sell Federal RFG in the Southern Maine Area as of September 30, 2021.

The Environmental Protection Agency (EPA or the ``Agency'') is proposing full approval of revisions to the South Dakota operating permit program for stationary sources under the Clean Air Act (CAA), title V (the ``title V program'') and a Clean Air Act (CAA) section 111(d)/129 negative declaration for incinerators subject to the Hospital/Medical/Infectious Waste Incinerators (HMIWI) Emissions Guidelines. EPA is proposing this action in accordance with the CAA.

The Environmental Protection Agency (EPA) is finalizing modifications of certain compliance dates under the Renewable Fuel Standard (RFS) program. First, EPA is extending the RFS compliance reporting deadline and the associated attest engagement reporting deadline for the 2019 compliance year for small refineries only. Second, EPA is extending the RFS compliance reporting deadline and the associated attest engagement reporting deadline for the 2020, 2021, and 2022 compliance years for all obligated parties.