# Air Plan Approval; Minnesota; Sulfur Dioxide
> **Rule** · Direct final rule. · Published 2016-06-27 · Effective 2016-08-26 · 81 FR 41447
## Document
- **Document number:** 2016-15038
- **Category:** air-emissions
- **Federal Register citation:** 81 FR 41447
- **CFR reference:** 40 CFR 52
- **Publication date:** 2016-06-27
- **Effective date:** 2016-08-26
- **State:** MN
- **EPA docket:** EPA-R05-OAR-2015-0366
## Abstract

The Environmental Protection Agency (EPA) is approving a revision to the Minnesota sulfur dioxide (SO<INF>2</INF>) State Implementation Plan (SIP) for the Flint Hills Resources, LLC Pine Bend Refinery (FHR) as submitted on May 1, 2015. The revision will consolidate existing permanent and enforceable SO<INF>2</INF> SIP conditions into the facility's joint Title I/Title V SIP document. This action highlights process modifications necessary to meet EPA's Tier 3 gasoline sulfur standards; a comprehensive monitoring strategy to better quantify SO<INF>2</INF> emissions from fuel gas-fired emission units; a new restrictive flaring procedure for refinery process units, and other updates and administrative changes. This revision results in a modeled reduction in SO<INF>2</INF> emissions from FHR and modeled SO<INF>2</INF> ambient air concentrations less than half of the national ambient air quality standards (NAAQS).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/06/27/2016-15038/air-plan-approval-minnesota-sulfur-dioxide)
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