Approval and Promulgation of Air Quality Implementation Plans; Wyoming; Incorporation by Reference Updates

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The Environmental Protection Agency (EPA) is approving eight State Implementation Plan (SIP) revisions submitted by the State of Wyoming; four submitted on March 27, 2017, and four submitted on March 28, 2018. The revisions include updates to incorporation by reference within several parts of the Wyoming Air Quality Standards and Regulations that are part of the SIP. Additional revisions are being approved that: Correct an inconsistency regarding internal combustion engine nitrogen oxide requirements; amend three state regulations to maintain consistency with federal regulations; and update a state internet address.