Sulfur Dioxide (SO2) Designations Round 4: Washington State Recommendation and EPA Response

Read the Washington recommendation for Round 4 area designations and EPA's response.

• State Recommendation - Whatcom County
• State Recommendation - Douglas and Chelan Counties
• Attachment - Douglas and Chelan Counties
• EPA Response to Round 4 Recommendation
• Technical Support Document
  • Chapter 1: Background and History of the Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard
  • Chapter 2: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Areas without Violating Monitors
  • Chapter 10: Intended Round 4 Area Designations for the 2010 1-Hour SO2 Primary National Ambient Air Quality Standard for Washington