Cal. Health and Safety Code § 40460

(a) No later than January 31, 1979, the south coast district board shall adopt a plan to achieve and maintain the state and federal ambient air quality standards for the South Coast Air Basin. The plan shall be revised and adopted by the south coast district board by January 31, 1982, according to a schedule consistent with subdivision (a) of Section 40463. The plan revisions shall be compiled by the south coast district board, with the cooperation of the state board and the Department of Transportation, and the active participation of the Southern California Association of Governments and the counties and cities within the South Coast Air Basin. (b) With the assistance of counties and cities, the Southern California Association of Governments shall have responsibility for preparing and approving the portions of the plan relating to regional demographic projections and integrated regional land use, housing, employment, and transportation programs, measures, and strategies. The Southern California Association of Governments shall analyze and provide emissions data related to its planning responsibilities. (c) The south coast district shall have the responsibility for preparing and analyzing the portions of the plan elements relating to existing air quality, emissions data, results of air quality modeling, and stationary source control measures. The south coast district shall combine its portion of the plan with those prepared by the Southern California Association of Governments. In consultation with the south coast district board, the Southern California Association of Governments, and other appropriate local agencies, the state board shall provide the emissions reductions attributed to technological vehicular source control strategies included in the plan. (d) Upon adoption by the state board, the plan and future revisions shall be the air quality management plan and, as submitted to the Environmental Protection Agency, the federally required state implementation plan for the South Coast Air Basin. Notwithstanding any other provision of this division, the state implementation plan for the air basin shall only include those provisions necessary to meet the requirements of the Clean Air Act (42 U.S.C. Sec. 7401 et seq.).