California Code, Health and Safety Code - HSC § 39602.5

(a) The state board shall adopt rules and regulations pursuant to Section 43013 that, in conjunction with other measures adopted by the state board, the districts, and the United States Environmental Protection Agency, will achieve ambient air quality standards required by the federal Clean Air Act (42 U.S.C. Sec. 7401 et seq.) in all areas of the state by the applicable attainment date, and to maintain these standards thereafter. The state board shall adopt these measures if they are necessary, technologically feasible, and cost effective, consistent with Section 43013.

(b) If necessary to carry out its duties under this section, the state board shall adopt and enforce rules and regulations that anticipate the development of new technologies or the improvement of existing technologies. The rules and regulations shall require standards that the state board finds and determines can likely be achieved by the compliance date set forth in the rule.