Section 243.125  Ozone

a)         Standard.  The ambient air quality standard for ozone is 0.12 ppm (235 micrograms per cubic meter) maximum 1-hour concentration not to be exceeded on more than one day per year.

b)         Measurement Method.  For determining conformance with the ozone air quality standard, ozone shall be measured by the ozone-ethylene reaction method as described in 40 CFR 50, App. D, (1982), as amended.

(Source:  Amended at 6 Ill. Reg. 5804, effective April 22, 1982)