"Acid gases" means, for the purposes of Section 9.4 of the Environmental Protection Act (the Act) (Ill. Rev. Stat. 1991, ch. 1111/2, par. 1009.4) [415 ILCS 5/9.4] , hydrogen chloride, hydrogen fluoride and hydrogen bromide, which exists as gases, liquid mist or any combination thereof.
Ill. Admin. Code tit. 35, § 211.170
Added at 17 Ill. Reg. 16504, effective September 27, 1993