The Environmental Protection Agency (EPA) is finalizing a program to further reduce air pollution, including ozone and particulate matter (PM), from heavy-duty engines and vehicles across the United States. The final program includes new emission standards that are significantly more stringent and that cover a wider range of heavy-duty engine operating conditions compared to today's standards; further, the final program requires these more stringent emissions standards to be met for a longer period of when these engines operate on the road.

Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is approving the CAA section 111(d) state plan submitted by the State of Arkansas for sources subject to the Municipal Solid Waste (MSW) Landfills Emission Guidelines (EG). The Arkansas MSW landfills plan was submitted to fulfill the state's obligations under CAA section 111(d) to implement and enforce the requirements under the MSW Landfills EG. The EPA is approving the state plan and amending the agency regulations in accordance with the requirements of the CAA.

On October 15, 2021, the United States Environmental Protection Agency's (EPA) Region 1 Acting Administrator signed a Memorandum of Agreement (MOA) between the Massachusetts Department of Environmental Protection (MassDEP) and EPA Region 1 regarding existing affected sources subject to Clean Air Act (CAA) sections 111(d) and/or 129 Federal Plan requirements. Subsequently, the MOA became effective upon signature of the MassDEP Commissioner on November 9, 2021. This document is informing the public of the MOA and making a copy of the document accessible.

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.