February 7, 2013 – In response to recommendations from state and tribal representatives, EPA sent letters to state and tribal leaders outlining the areas it is considering designating as “nonattainment” for the 2010 primary standard for sulfur dioxide. 

• Read Correspondence Between EPA and State and Tribal Representatives
• Map of Preliminary Nonattainment Areas for the 2010 Sulfur Dioxide Standard
• EPA's strategy on Next Steps for Area Designations and Implementation of the SO2 Standard
• Notice of Availability and Public Comment Period (PDF) (3pp, 225k) - Federal Register - Feb 15, 2013

• Table Comparing State Recommendations and EPA Responses (PDF)(1 pg, 66 K)