Ill. Admin. Code tit. 35 § 211.4530
Current through Register Vol. 48, No. 24, June 14, 2024
"Parts per million (volume)" or "PPM (vol)" means a volume/volume ratio which expresses the volumetric concentration of gaseous air contaminant in a million unit volume of gas.
Ill. Admin. Code tit. 35, § 211.4530
Added at 17 Ill. Reg. 16504, effective September 27, 1993