Under the SO₂ Data Requirements Rule (DRR), air agencies were required, by July 1, 2016, to notify EPA of their selected approach for characterizing air quality around each SO₂ source that is subject to 40 CFR 51.1203. The DRR provided state air agencies with the following four options for meeting the DRR pathway requirement:

1. Air quality modeling.
2. Air quality monitoring.
3. Adopt federally enforceable emission limits for a source to reduce emissions below 2,000 tpy, unless further air quality characterization is required in the judgment of the air agency or EPA.
4. Submit documentation that a source has permanently shut down by January 13, 2017.

SO₂ Data Requirements Rule State Pathway Notifications (July 1st):

In some cases, in addition to the pathway notifications, the files below include modeling protocols, monitoring plans and/or other information.

For questions concerning a state’s complete submittal, please contact the regional office associated with the affected state. 

• DRR State Notification Pathway (PDF)(9 pp, 362 K, Sep 19, 2016)
• Alabama Source Characterization Submittal (PDF)(3 pp, 2 MB)
• Arizona Source Characterization Submittal (PDF)(2 pp, 70 K)
• Arkansas Source Characterization Submittal 1 (PDF)(11 pp, 2 MB)
• Arkansas Source Characterization Submittal 2 (PDF)(10 pp, 2 MB)
• California Source Characterization Submittal (PDF)(3 pp, 684 K)
• Colorado Source Characterization Submittal (PDF)(2 pp, 987 K)
• Connecticut Source Characterization Submittal (PDF)(1 pg, 71 K)
• Florida Source Characterization Submittal (PDF)(5 pp, 387 K)
• Georgia Source Characterization Submittal (PDF)(2 pp, 99 K)
• Guam Source Characterization Submittal (PDF)(1 pg, 78 K)
• Hawaii Source Characterization Submittal (PDF)(1 pg, 108 K)
• Illinois Source Characterization Submittal (PDF)(2 pp, 288 K)
• Indiana Source Characterization Submittal (PDF)(104 pp, 8 MB)
• Iowa Source Characterization Submittal (PDF)(3 pp, 3 MB)
• Kansas Source Characterization Submittal (PDF)(19 pp, 9 MB)
• Kentucky Source Characterization Submittal (PDF)(2 pp, 61 K)
• Louisiana Source Characterization Submittal (PDF)(57 pp, 12 MB)
• Maine Source Characterization Submittal (PDF)(2 pp, 4 MB)
• Maryland Source Characterization Submittal (PDF)(2 pp, 515 K)
• Michigan Source Characterization Submittal (PDF)(1 pg, 63 K)
• Minnesota Source Characterization Submittal (PDF)(2 pp, 1 MB)
• Mississippi Source Characterization Submittal (PDF)(2 pp, 108 K)
• Missouri Source Characterization Submittal (PDF)(3 pp, 1 MB)
• Montana Source Characterization Submittal (PDF)(1 pg, 615 K)
• Navajo Nation Source Characterization Submittal (PDF)(2 pp, 999 K)
• Nebraska Source Characterization Submittal (PDF)(3 pp, 144 K)
• Nevada Source Characterization Submittal (PDF)(2 pp, 92 K)
• New Hampshire Source Characterization Submittal (PDF)(2 pp, 354 K)
• New Mexico Source Characterization Submittal (PDF)(2 pp, 237 K)
• New York Source Characterization Submittal (PDF)(2 pp, 1 MB)
• North Carolina Source Characterization Submittal (PDF)(3 pp, 156 K)
• North Dakota Source Characterization Submittal (PDF)(2 pp, 85 K)
• Ohio Source Characterization Submittal (PDF)(22 pp, 9 MB)
• Oklahoma Source Characterization Submittal (PDF)(4 pp, 1 MB)
• Oregon Source Characterization Submittal (PDF)(1 pg, 68 K)
• Pennsylvania Source Characterization Submittal (PDF)(3 pp, 1 MB)
• Puerto Rico Source Characterization Submittal (PDF)(2 pp, 1 MB)
• South Carolina Source Characterization Submittal (PDF)(4 pp, 991 K)
• Tennessee Source Characterization Submittal (PDF)(5 pp, 309 K)
• Texas Source Characterization Submittal (PDF)(2 pp, 74 K)
• Utah Source Characterization Submittal (PDF)(2 pp, 95 K)
• Virginia Source Characterization Submittal (PDF)(2 pp, 696 K)
• Washington Source Characterization Submittal (PDF)(2 pp, 450 K)
• West Virginia Source Characterization Submittal (PDF)(2 pp, 404 K)
• Wisconsin Source Characterization Submittal (PDF)(2 pp, 635 K)
• Wyoming Source Characterization Submittal (PDF)(6 pp, 2 MB)