The Environmental Protection Agency (EPA) is approving most elements of a State Implementation Plan (SIP) revision submitted by the State of Rhode Island. This revision addresses the infrastructure requirements of the Clean Air Act (CAA or Act) for the 2012 annual fine particle (PM<INF>2.5</INF>) National Ambient Air Quality Standard (NAAQS). We are not taking action on three elements of this submittal in sections 110(a)(2)(C), (D)(i)(II), and (J) that relate to requirements for the State's Prevention of Significant Deterioration (PSD) program.

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the State Implementation Plan (SIP) for the State of Missouri submitted on January 30, 2020. This final action amends the SIP by approving revisions to a state regulation that limits the use of dispersion techniques to meet ambient air quality standards in the vicinity of major sources of air pollution. These revisions to the state rule are a revised restructured version of the same rule. The revisions are administrative in nature and do not impact the stringency of the SIP or air quality.

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 approving a state implementation plan (SIP) revision submitted by the State of Colorado. The submittal certifies that the State of Colorado has fulfilled, through previous SIP revisions, Nonattainment New Source Review (NNSR) Permit Program requirements under the 2015 8-hour ozone National Ambient Air Quality Standards (NAAQS) for the Denver Metro/North Front Range (DMNFR) area. The State of Colorado submitted the certification to meet the nonattainment requirements for Marginal ozone nonattainment areas (NAAs) for the 2015 8-hour ozone NAAQS.