Pursuant to 35 Ill. Adm. Code 216.121, no owner or operator of a PBR boiler may cause or allow the emission of CO into the atmosphere from any fuel combustion emission source with actual heat input greater than 2.9 MW (10 MMBtu/hr) to exceed 200 ppm, corrected to 50 percent excess air.
Ill. Admin. Code tit. 35, § 201.625