Initial Technical Support Documents for Area Designations Round 4

The Technical Support Documents below support EPA's intended Round 4 area designations for the 2010 sulfur dioxide air quality standard.

• 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) (186.27 KB)
• 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) (306.31 KB)
• Chapter 3: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Kentucky (pdf) (1.14 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) (1.2 MB)
• Chapter 5: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Missouri (pdf) (1.82 MB)
• Chapter 6: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for New York (pdf) (690.68 KB)
• Chapter 7: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for North Carolina (pdf) (1.43 MB)
• Chapter 8: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Texas (pdf) (5.34 MB)
• Chapter 9: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Virginia (pdf) (3.58 MB)
• Chapter 10: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Washington (pdf) (3.61 MB)
• Chapter 11: Intended Round 4 Area Designation for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Wisconsin (pdf) (3.3 MB)
• Chapter 12: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Pennsylvania (pdf) (4.25 MB)