US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER a: PERMITS AND GENERAL PROVISIONSPart 201 — PERMITS AND GENERAL PROVISIONSSubpart N201.61535 Ill. Adm. Code 201.615Opacity RequirementsLast amended: 2017Year: 2026Length: 24 wordsOfficial source Section 201.615 Opacity Requirements The owner or operator of the source must comply with the applicable provisions of 35 Ill. Adm. Code 212.Subpart B.Previous35 Ill. Adm. Code 201.610Next35 Ill. Adm. Code 201.620