SO2 NAAQS Nonattainment Areas
Current understanding
To be populated as evidence accumulates.
Evidence log
- 2026-08-20 — Air Plan Approval; Arizona; Attainment Plan for the Hayden SO2 Nonattainment Area for the 1971 and 2010 Sulfur Dioxide National Ambient Air Quality Standards: EPA finalized approval of Arizona’s attainment plan for the Hayden SO2 nonattainment area under the 1971 and 2010 SO2 NAAQS, making the state’s emission limits and control measures federally enforceable. (novelty: 2)
Open questions
Related
Contributing findings
Air Plan Approval; Arizona; Attainment Plan for the Hayden SO2 Nonattainment Area for the 1971 and 2010 Sulfur Dioxide National Ambient Air Quality Standards
20-aug-2026
novelty 2
per-area 2
introduces