EPA is approving revisions to Kansas' State Implementation Plan (SIP) to include updates to its Prevention of Significant Deterioration (PSD) of Air Quality rule, which incorporate portions of the New Source Review (NSR) program promulgated by the Environmental Protection Agency in December 2002. Specifically, these revisions adopt by reference provisions of 40 CFR 52.21 as in effect July 1, 2004, except for subsections with references to the clean unit exemptions, pollution control projects, and the record keeping provisions for the actual-to-projected-actual emissions applicability test. Kansas did not adopt the latter provisions because of the June 2005 decision by the United States Court of Appeals for the District of Columbia Circuit, which vacated the clean unit exemption and pollution control project provisions and remanded back to EPA the record keeping provisions for the actual-to-projected-actual emissions applicability test. We proposed to approve the revisions on January 31, 2007, and received no comments on the proposal.