The Pollution Control Board adopted amendments to 35 Ill. Code r. 201, Permits and General Provisions; 211, Definitions and General Provisions; and 217, Nitrogen Oxides (NOx) Emissions. The amendments control NOx emissions from engines and turbines located at 100 ton per year sources located in the Chicago and Metro East/St. Louis nonattainment areas with a capacity of 500 brake horsepower or 3.5 megawatts. http://www.cyberdriveillinois.com/departments/index/register/register_volume33_issue34.pdf pp. 11965-12031.