US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER l: AIR QUALITY STANDARDS AND EPISODESPart 243 — AIR QUALITY STANDARDSSubpart A243.10435 Ill. Adm. Code 243.104Nondegradation (Repealed)Last amended: 2013Year: 2026Length: 6 wordsOfficial source Section 243 Section 243.104 Nondegradation (Repealed)Previous35 Ill. Adm. Code 243.103Next35 Ill. Adm. Code 243.105