# 40 C.F.R. § 52.71 (2026): Classification of regions

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_71

## Section

- **Citation:** 40 C.F.R. § 52.71 (2026)
- **Heading:** Classification of regions
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 40 CFR: Protection of Environment / Chapter I / Part 52 / Subpart C / § 52.71: § 52.71   Classification of regions.

## Text

The Alaska plan was evaluated on the basis of the following classifications: Air quality control Region Pollutant Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone Cook Inlet Intrastate I III III I III. Northern Alaska Intrastate I III III I III. South Central Alaska Intrastate III III III III III. Southeastern Alaska Intrastate III III III III III. [37 FR 10848, May 31, 1972, as amended at 48 FR 30625, July 5, 1983]

## Nearby sections

- [40 C.F.R. § 52.70 (2026) § 52.70   Identification of plan.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_70.md)
- [40 C.F.R. § 52.71 (2026) § 52.71   Classification of regions.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_71.md)
- [40 C.F.R. § 52.72 (2026) § 52.72   Approval status.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_72.md)
- [40 C.F.R. § 52.73 (2026) § 52.73   Approval of plans.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_73.md)
- [40 C.F.R. § 52.74 (2026) § 52.74   Original identification of plan section.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_74.md)
- [40 C.F.R. § 52.76 (2026) § 52.76   1990 Base Year Emission Inventory.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_76.md)
- [40 C.F.R. § 52.82 (2026) § 52.82   Extensions.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_82.md)
- [40 C.F.R. § 52.96 (2026) § 52.96   Significant deterioration of air quality.](https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_96.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T40_P52_S52_71. Check the current official text before relying on it. Not legal advice.