EPA Approves Indiana's Plan to Protect Air Quality and Visibility
Official: Air Plan Approvals; Indiana; Prong 4 (Visibility) for the 2015 Ozone National Ambient Air Quality Standard
Reading: EPA approval of Indiana's existing State Implementation Plan infrastructure requirements continues the state's established air quality management program without substantive changes to stringency.
The decision takes effect on October 9, 2026.
In clear language
The EPA is approving Indiana's plan to ensure its air quality programs meet federal Clean Air Act requirements, including rules to prevent pollution that would harm visibility in other states. This approval confirms Indiana has adequate safeguards in place to manage air emissions and protect air quality across state lines. The decision takes effect on October 9, 2026.
How does this affect you?
Pick the type of resident or organization you most identify with — we'll generate a plain-language breakdown of what changes for you and what you can do about it.
Who does this affect?
- Residents of Indiana and neighboring states who depend on clean air and clear visibility
- Indiana's environmental agencies and businesses subject to air quality regulations
- States downwind of Indiana that benefit from visibility protection measures
What can you do?
- Stay informed about your state's air quality by checking EPA AirNow reports and local air quality alerts
- Support or participate in local initiatives to reduce vehicle emissions and industrial pollution
Timeline
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- 2026-04-10: EPA proposed the approval
- 2026-10-09: Approval becomes effective
No New Jersey official has a verified action on this policy yet.
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