Part 81 - DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES
- Subpart A - MEANING OF TERMS (§ 81.1)
- Subpart B - DESIGNATION OF AIR QUALITY CONTROL REGIONS (§§ 81.11 — 81.121)
- Subpart C - SECTION 107 ATTAINMENT STATUS DESIGNATIONS (§§ 81.300 — 81.356)
- Subpart D - IDENTIFICATION OF MANDATORY CLASS I FEDERAL AREAS WHERE VISIBILITY IS AN IMPORTANT VALUE (§§ 81.400 — 81.437)
- Subpart E - IDENTIFICATION OF INTERSTATE TRANSPORT REGIONS (§§ 81.455 — 81.457)
- Appendix A to Part 81 - Air Quality Control Regions (AQCR's)