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Regulations last checked for updates: Dec 14, 2025
Title 40 - Protection of Environment last revised: Dec 05, 2025
All Titles
Title 40
Chapter I
Part 57
Subpart B - Subpart B—The Application and the NSO Process
§ 57.201 - Where to apply.
§ 57.202 - How to apply.
§ 57.203 - Contents of the application.
§ 57.204 - EPA action on second period NSOs which have already been issued.
§ 57.205 - Submission of supplementary information upon relaxation of an SO2 SIP emission limitation.
authority:
Secs. 110, 114, 119, 301, Clean Air Act, as amended (
42 U.S.C. 7410
,
7414
,
7419
,
and
; sec. 406 of Pub. L. 95-95
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