Cal. Health and Safety Code § 41502

(a) Before taking any action pursuant to Section 41503, 41504, 41505, or 41652, the state board shall hold a public hearing within the air basin affected, upon a 45-day written notice given to the basinwide air pollution control council, if any, the affected districts, the affected air quality planning agencies, and the public. However, except with respect to action taken pursuant to Section 41652, upon receipt of evidence that a concentration of air contaminants in any place is presenting an imminent and substantial endangerment to the health of persons, and that the districts affected are not taking reasonable action to abate the concentration of air contaminants, the state board shall give, orally if necessary, as much notice as possible, but not less than 24 hours. The state board shall, in the action taken, include a statement of the facts which prevented the state board from giving a 45-day written notice. (b) In addition to any other statutory requirements, interested persons shall have the right, at the public hearing, to present oral and written evidence and to question and solicit testimony of qualified representatives of the state board on the matter being considered. The state board may, at the public hearing, place reasonable limits on such right to question and solicit testimony. (c) If, after conducting the public hearing required by subdivision (a), the state board determines to take action pursuant to any section enumerated in subdivision (a), the state board shall, based on the record of the public hearing, adopt written findings which explain the action to be taken by the state board, why the state board decided to take the action, and why the action is authorized by, and meets the requirements of, the statutory provisions pursuant to which it was taken. In addition, the findings shall address the significant issues raised or written evidence presented by interested persons or the staff of the state board. The transcript of testimony and exhibits, together with all papers and requests filed in the proceedings, shall constitute the exclusive record for decision by the state board. (d) Subdivisions (a), (b), and (c) shall be applicable to the executive officer of the state board acting pursuant to Section 39515, or to his delegates acting pursuant to Section 39516, with respect to any action taken pursuant to any section enumerated in subdivision (a).