# Revisions to Regional Haze Rule To Incorporate Sulfur Dioxide Milestones and Backstop Emissions Trading Program for Nine Western States and Eligible Indian Tribes Within That Geographic Area
> **Rule** · Final rule. · Published 2003-06-05 · Effective 2003-08-04 · 68 FR 33764
## Document
- **Document number:** 03-13255
- **Category:** other
- **Federal Register citation:** 68 FR 33764
- **CFR reference:** 40 CFR 51
- **Publication date:** 2003-06-05
- **Effective date:** 2003-08-04
- **EPA docket:** FRL-7504-4
## Abstract

The purpose of this rule is to revise EPA's regional haze rule to incorporate certain provisions for Western States and eligible Indian Tribes. The Western Regional Air Partnership (WRAP) submitted an Annex to the 1996 report of the Grand Canyon Visibility Transport Commission (GCVTC) to EPA on September 29, 2000. This submittal was required under the regional haze rule in order for nine Western States (and Indian Tribes within the same geographic region) to have the option of submitting plans implementing the GCVTC recommendations. The Annex contains recommendations for implementing the regional haze rule in nine Western States, including a set of recommended regional emissions milestones. The milestones address, for the time period between 2003 and 2018, emissions of sulfur dioxide (SO<INF>2</INF>), a key precursor to the formation of fine particles and regional haze.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/06/05/03-13255/revisions-to-regional-haze-rule-to-incorporate-sulfur-dioxide-milestones-and-backstop-emissions)
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