US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER a: PERMITS AND GENERAL PROVISIONSPart 203 — MAJOR STATIONARY SOURCES CONSTRUCTION AND MODIFICATIONSubpart F203.60335 Ill. Adm. Code 203.603Ambient Monitoring Requirement (Repealed)Last amended: 1988Year: 2026Length: 8 wordsOfficial source Section 203 Section 203.603 Ambient Monitoring Requirement (Repealed)Previous35 Ill. Adm. Code 203.602