US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 58 — AMBIENT AIR QUALITY SURVEILLANCEAppendix F to Part 5840 C.F.R. Appendix F to Part 58[Reserved]ReservedLast amended: 2016Year: 2026Length: 8 wordsOfficial source Cite as 40 C.F.R. Appendix F to Part 58 (2026)40 C.F.R. Appendix F to Part 58. [Reserved]Previous40 C.F.R. Appendix E to Part 58Next40 C.F.R. Appendix G to Part 58