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.

The Environmental Protection Agency (EPA) is proposing a rule that would reduce air pollution from highway heavy-duty vehicles and engines, including ozone, particulate matter, and greenhouse gases. This proposal would change the heavy-duty emission control program-- including the standards, test procedures, useful life, warranty, and other requirements--to further reduce the air quality impacts of heavy- duty engines across a range of operating conditions and over a longer period of the operational life of heavy-duty engines.

The Environmental Protection Agency (EPA) is approving the state plan submitted by New York State to implement and enforce Emission Guidelines (EG) for existing large municipal waste combustor (MWC) units. The state plan is consistent with the amended EG promulgated by the EPA on May 10, 2006. New York's plan establishes emission limits and other requirements for the purpose of reducing emissions of lead, mercury, cadmium, organics, hydrogen chloride, and other air pollutants from large MWC units throughout the state.