Regional Haze (Visibility Protection)
Current understanding
To be populated as evidence accumulates.
Evidence log
- 2026-08-27 — Air Plan Approval; Arkansas; Regional Haze State Implementation Plan for the Second Implementation Period: EPA final rule (final-rule) approves Arkansas’s Regional Haze SIP for the second implementation period (2018–2028), covering reasonable-progress determinations for man-made visibility impairment at Class I areas. (novelty: 2)
Open questions
Related
Contributing findings
Air Plan Approval; Arkansas; Regional Haze State Implementation Plan for the Second Implementation Period
27-aug-2026
novelty 2
per-area 2
strengthens