California Code, Health and Safety Code - HSC § 39657

(a) Except as provided in subdivision (b), the state board shall identify toxic air contaminants which are emitted into the ambient air of the state using the procedures and following the requirements prescribed by Article 3 (commencing with Section 39660).

(b) The state board shall, by regulation, designate any substance that is listed as a hazardous air pollutant pursuant to subsection (b) of Section 112 of the federal act (42 U.S.C. Sec. 7412(b)) as a toxic air contaminant. A regulation that designates a hazardous air pollutant as a toxic air contaminant shall be deemed to be a regulation mandated by federal law and is not subject to Sections 11346.2 and 11346.9 of the Government Code, Article 6 (commencing with Section 11349) of Chapter 3.5 of Part 1 of Division 3 of Title 2 of the Government Code, or Article 3 (commencing with Section 39660).