The Technical Support Documents below support EPA's intended Round 4 area designations for the 2010 sulfur dioxide air quality standard.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Chapter 1: Background and History of the Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard (PDF)(11 pp, 191 K)
- Chapter 2: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Areas without Violating Monitors (PDF)(28 pp, 314 K)
- Chapter 3: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Kentucky (PDF)(25 pp, 1 MB)
- Chapter 4: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Maryland and West Virginia (PDF)(15 pp, 1 MB)
- Chapter 5: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Missouri (PDF)(35 pp, 2 MB)
- Chapter 6: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for New York (PDF)(21 pp, 707 K)
- Chapter 7: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for North Carolina (PDF)(47 pp, 1 MB)
- Chapter 8: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Texas (PDF)(69 pp, 6 MB)
- Chapter 9: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Virginia (PDF)(35 pp, 4 MB)
- Chapter 10: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Washington (PDF)(53 pp, 4 MB)
- Chapter 11: Intended Round 4 Area Designation for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Wisconsin (PDF)(21 pp, 3 MB)
- Chapter 12: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Pennsylvania (PDF)(33 pp, 4 MB)