# Indiana Regional Haze SIP Second Implementation Period

> **EPA** · Rulemaking · Modified 2026-01-26T12:38:15Z

## Docket
- **Docket ID:** EPA-R05-OAR-2021-0963
- **Agency:** EPA
- **Type:** Rulemaking
- **Last modified:** 2026-01-26T12:38:15Z

## Source
- [regulations.gov docket](https://www.regulations.gov/docket/EPA-R05-OAR-2021-0963)
- [Public comments](https://www.regulations.gov/docket/EPA-R05-OAR-2021-0963/comments)

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