# Air Plan Approval; Indiana; Alcoa BART
> **Rule** · Direct final rule. · Published 2015-08-20 · Effective 2015-10-19 · 80 FR 50579
## Document
- **Document number:** 2015-20528
- **Category:** air-emissions
- **Federal Register citation:** 80 FR 50579
- **CFR reference:** 40 CFR 52
- **Publication date:** 2015-08-20
- **Effective date:** 2015-10-19
- **State:** IN
- **EPA docket:** EPA-R05-OAR-2014-0660
## Abstract

The Environmental Protection Agency (EPA) is approving a revision to the Alcoa Best Available Retrofit Technology (BART) averaging time for nitrogen oxides (NO<INF>X</INF>) in the Indiana State Implementation Plan (SIP). On July 23, 2014, the Indiana Department of Environmental Management (IDEM) submitted to EPA a revision to the daily NO<INF>X</INF> emissions limits, changing from a rolling 24-hour average to a 24-hour daily average. IDEM provided a statistical analysis showing that no significant increase in emissions will occur as a result of this change. EPA is approving this SIP revision because it will not interfere with attainment or maintenance of the National Ambient Air Quality Standard (NAAQS).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/08/20/2015-20528/air-plan-approval-indiana-alcoa-bart)
---
*AI Analytics · CC0 1.0*