US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER a: PERMITS AND GENERAL PROVISIONSPart 204 — PREVENTION OF SIGNIFICANT DETERIORATIONSubpart B204.20035 Ill. Adm. Code 204.200DefinitionsYear: 2026Length: 28 wordsOfficial source Section 204.200 Definitions Unless otherwise specified in this Part, terms used in this Part have the same meaning as the terms used in 35 Ill. Adm. Code 211.Next35 Ill. Adm. Code 204.210