U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 40Chapter IPart 63Subpart NN - Subpart NN—National Emission Standards for Hazardous Air Pollutants for Wool Fiberglass Manufacturing at Area Sources
View all text of Subpart NN [§ 63.880 - § 63.899]
§ 63.888 - Startups and shutdowns.

You must meet all applicable startup and shutdown provisions contained in subpart NNN of this part.

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