Section 52.736 - Review of new sources and modifications(b) The rules submitted by the State on March 24, 1988, to satisfy the requirements of the Clean Air Act are approved. These rules are part 203: Major Stationary Sources Construction and Modification as effective March 22, 1991. The moratorium on construction and modification of new sources in nonattainment areas as provided in section 110(a)(2)(I) of the Clean Air Act is revoked.57 FR 59935, Dec. 17, 1992