US lawIllinoisRegulationsTitle 35 ā ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER l: AIR QUALITY STANDARDS AND EPISODESPart 243 ā AIR QUALITY STANDARDS243.APPENDIX35 Ill. Adm. Code 243.APPENDIXC Past Compliance Dates (Repealed)Last amended: 2013Year: 2026Length: 9 wordsOfficial source Section 243 Section 243.APPENDIX CĀ Past Compliance Dates (Repealed)Next35 Ill. Adm. Code 243.APPENDIX A