Approval and Promulgation of State Implementation Plan Revisions to Primary Air Quality Standards, Minor Source Baseline Date, Incorporation by Reference, and 2008 Ozone NAAQS Infrastructure Requirements for CAA Section 110(a)(2)(C) and (D)(i)(II); Wyoming

The Environmental Protection Agency (EPA) is approving State Implementation Plan (SIP) revisions submitted by the State of Wyoming in two submittals on May 28, 2015 and one submittal on November 6, 2015. The final amendments update the version of the Code of Federal Regulations (CFR) incorporated by reference into the Wyoming Air Quality Standards and Regulations (WAQSR) for Chapter 2, Ambient Standards, Sections 12; Chapter 3, General Emission Standards, Section 9; and Chapter 6, Prevention of Significant Deterioration, Section 4. The EPA also approves the revision in one of the May 28, 2015 submittals that updates a citation to a Federal Register article (i.e., Federal Register notice) under the definition of "tpy CO<INF>2</INF> equivalent emissions (CO<INF>2</INF>e)," and lists a new minor source baseline date for fine particulate. The EPA also approves the updates to the primary air quality standards for particulate matter (PM<INF>2.5</INF>) to reflect federal updates that went into effect in January 2013. The updated primary PM<INF>2.5</INF> standard is 12 micrograms per cubic meter ([micro]g/m\3\) annual arithmetic mean concentration, which is lowered from its previous level of 15 [micro]g/ m\3\. The EPA is also approving portions of the State's February 6, 2014 2008 ozone National Ambient Air Quality Standards (NAAQS) infrastructure certification regarding prevention of significant deterioration (PSD). The EPA is not taking action in this final rule on the Chapter 6, Permitting Requirements, Section 14 portion of a May 24, 2012 submittal or one of the May 28, 2015 submittals because it has been superseded by a November 6, 2015 submittal that the EPA approved in a separate action. The EPA is not taking action on a May 24, 2012 submittal or a March 8, 2013 submittal because they have been superseded by one of the May 28, 2015 submittals.