Illinois is in the process of NOx reasonably available control technology (RACT) rulemaking to address ozone and PM2.5 nonattainment in the St. Louis (Metro East) and Chicago areas.  A proposed rule is before the Illinois Pollution Control Board (IPCB) (Docket Number R2008-019) to modify 35 IAC 217.
The proposed rule repeals 35 IAC 217.121, which applies to fossil fuel combustion sources in any part of the state.  The proposed rule also specifies emissions limits (or, in some cases, requires combustion tuning) for industrial boilers, process heaters, glass melting furnaces, cement and lime kilns, iron and steel and aluminum manufacturing furnaces, and electrical generating units at major sources in the Metro East and Chicago nonattainment areas (stationary internal combustion engines and turbines are being regulated in a separate rulemaking under Docket Number R2007-019).  Major sources are sources that have the potential to emit at least 100 tons per year of NOx.  Generally, units that do not emit more than 15 tons per year and 5 tons per ozone season are exempt.  Additionally, units complying with the combined pollutant standard (CPS) or multi-pollutant standard (MPS) in 35 IAC 225 are exempt from the proposed RACT rules.   The proposed rule also specifies monitoring, testing, recordkeeping, and reporting requirements, including provisions for demonstrating compliance through emissions averaging with other units, subject to certain limitations, at the source.  Lastly, the proposed rule specifies a compliance date of May 1, 2010.
Public hearings for this proposed rule were held on October 14, 2008 and December 9 and 10, 2008, and a third hearing is scheduled for February 3, 2009 in Edwardsville.  Additionally, comments are being accepted on the engines and turbines rulemaking until February 2, 2009.