(a) No person subject to the provisions of this Part will allow or cause emissions to the outdoor atmosphere of gases from any fluid catalytic cracking unit catalyst regenerator exhibiting greater than 30 percent opacity except for one six-minute average opacity reading in any one-hour period.

(b) Except as provided in subdivision (a) of this section, no person subject to the provisions of this Part shall allow or cause emissions to the outdoor atmosphere having an opacity of 20 percent or greater.

(c) All refinery flares shall be equipped with smokeless tips.