The Environmental Protection Agency (EPA) is taking final action to approve revisions to the San Diego Air Pollution Control District (SDAPCD or ``District'') portion of the California State Implementation Plan (SIP). These revisions concern SDAPCD's negative declarations for certain Control Techniques Guidelines (CTGs) as they apply to the 2008 and 2015 ozone national ambient air quality standards (NAAQS or ``standards'') reasonably available control technology (RACT) SIP. We are approving revisions that regulate these emission sources under the Clean Air Act (CAA or the Act).

The Environmental Protection Agency (EPA) is proposing to approve the State Implementation Plan (SIP) revision submitted by the State of New Mexico, through New Mexico Environment Department (NMED) dated June 25, 2021, for the purpose of addressing the Clean Air Act (CAA or ``Act'') ``good neighbor'' interstate transport (prongs 1 and 2) infrastructure SIP requirements for the 2010 1-hour Nitrogen Dioxide (NO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS).

The Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision submitted by the State of Delaware. This revision pertains to the reduction of volatile organic compounds (VOC) emissions from cold solvent cleaning operations. This action is being taken under the Clean Air Act (CAA).

The Clean Air Act (CAA) requires each state implementation plan (SIP) to contain adequate provisions prohibiting emissions that will significantly contribute to nonattainment or interfere with maintenance of air quality in other states. The State of Arizona submitted a SIP revision to the Environmental Protection Agency (EPA) to address these requirements for the 2015 ozone national ambient air quality standards (NAAQS).