The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of North Carolina's Department of Environmental Quality (DEQ), Division of Air Quality (DAQ or Division), via a letter dated April 13, 2021. This rulemaking addresses the repeal of a State regulation related to delegation of authority and removal of the regulation from the North Carolina SIP. EPA is finalizing approval of these changes pursuant to the Clean Air Act (CAA or Act).

The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Clark County Department of Environment and Sustainability (DES) portion of the Nevada State Implementation Plan (SIP). These revisions concern the title change of the Clark County Department of Air Quality to the Department of Environment and Sustainability.

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.

The Environmental Protection Agency (EPA) is approving a revision to the Oregon State Implementation Plan (SIP) submitted on November 5, 2020. The revision establishes new fees to be paid by stationary sources of air contaminants that submit notices of intent to construct. The revision also adds a new basic air contaminant discharge permit category to allow certain minor sources, that would otherwise be required to obtain a general, simple, or standard permit, the option to qualify for a basic permit.