US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER a: PERMITS AND GENERAL PROVISIONSPart 204 — PREVENTION OF SIGNIFICANT DETERIORATIONSubpart K204.167035 Ill. Adm. Code 204.1670Lowest Achievable Emission Rate (LAER)Last amended: 2025Year: 2026Length: 23 wordsOfficial source Section 204.1670 Lowest Achievable Emission Rate (LAER) "Lowest achievable emission rate" or "LAER" has the meaning given by 35 Ill. Adm. Code 203.Previous35 Ill. Adm. Code 204.1660Next35 Ill. Adm. Code 204.1680