Code of Federal Regulations Title 40. Protection of Environment § 40.63.1157 Emission standards for existing sources

(1) Any gases that contain HCl in a concentration in excess of 18 parts per million by volume (ppmv);  or

(2) HCl at a mass emission rate that corresponds to a collection efficiency of less than 97 percent.

(1) No owner or operator of an existing affected plant shall cause or allow to be discharged into the atmosphere from the affected plant any gases that contain HCl in a concentration greater than 25 ppmv.

(2) In addition to the requirement of paragraph (b)(1) of this section, no owner or operator of an existing plant shall cause or allow to be discharged into the atmosphere from the affected plant any gases that contain chlorine (Cl₂) in a concentration in excess of 6 ppmv.