U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 52Subpart N - Subpart N—Idaho
§ 52.670 - Identification of plan.
§ 52.671 - Classification of regions.
§ 52.672 - Approval of plans.
§ 52.673 - Approval status.
§ 52.674 - [Reserved]
§ 52.675 - Control strategy: Sulfur oxides—Eastern Idaho Intrastate Air Quality Control Region.
§ 52.676 - [Reserved]
§ 52.677 - Original identification of plan section.
§§ 52.678-52.680 - §[Reserved]
§ 52.681 - Permits to construct and tier II operating permits.
§ 52.682 - [Reserved]
§ 52.683 - Significant deterioration of air quality.
§§ 52.684-52.689 - §[Reserved]
§ 52.690 - Visibility protection.
§ 52.691 - Extensions.
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