The purpose of this Subpart is to control the emissions of nitrogen oxides (NO_x) from electrical generating units (EGUs) during the ozone control period (for purposes of Subpart V, the ozone control period is May 1 through September 30 of each year, beginning in 2003), by limiting the emissions of NO_x from EGUs to no more than 0.25 lbs/mmbtu of actual heat input during each ozone control period.

(Source: Added at 25 Ill. Reg. 5914, effective April 17, 2001)