Federal (United States) · Regulations
Part 81 — DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES
345 sections
5 groups
- Subpart A — Meaning of Terms1 section
- Subpart B — Designation of Air Quality Control Regions246 sections
- Subpart C — Section 107 Attainment Status Designations57 sections
- Subpart D — Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value38 sections
- Subpart E — Identification of Interstate Transport Regions2 sections