State Implementation Plan (SIP) - Regional Haze

To reduce haze, and to meet requirements of the Clean Air Act, U.S. EPA in April 1999 issued a regional haze rule aimed at protecting visibility in 156 federal areas. The rule seeks to reduce the visibility impairment caused by many sources over a wide area. Additional information about the regional haze rule can be found on U.S. EPA's website.

State Implementation Plan



Letter to U.S. EPA



Public Hearing Results

Other Communications

Proposed Rule Date and FR Notice

Final Rule Date and FR Notice

Effective Date

Statewide SIP

March 11, 2011

March 2011


See Appendix G and H


Jan. 25, 2012
77 FR 3712

July 2, 2012
77 FR 39177

Aug. 1, 2012

Statewide SIP

April 14, 2014



See Appendix B


Dec. 9, 2015
80 FR 76403

Mar. 4, 2016
81 FR 11445

Apr. 4, 2016

Statewide SIP

November 30, 2016

August 2015





Prong 4 Visibility
Dec. 21, 2017
82 FR 60572
Prong 4 Visibility
May 10, 2018
83 FR 21719
June 11, 2018

Statewide 5-Year Progress Report

March 11, 2016

March 2016




Oct. 16, 2017
82 FR 48030

Dec. 21, 2017
82 FR 60543

Jan. 22, 2018




BART Sources

U.S. EPA's regional haze rule requires states to evaluate certain sources for the necessity of best available retrofit technology (BART). The above SIP document identifies Ohio's analysis of sources located within the state. Ohio found one facility requiring BART; P.H. Glatfelter.

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