Designation and NAAQS Information Related to SO2 (2010 Standard)
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- Revised SO2 (2010 Standard) Designation Notices
- Extension of Deadline for Promulgating Designations for the 2010 Primary Sulfur Dioxide NAAQS (August 3, 2012)
See 77 FR 46295 - Air Quality Designations for the 2010 Sulfur Dioxide (SO2) Primary NAAQS (August 5, 2013)
See 78 FR 47191 - Air Quality Designations for the 2010 Sulfur Dioxide (SO2) Primary NAAQS - Round 2 (July 12, 2016)
See 81 FR 45039
- Extension of Deadline for Promulgating Designations for the 2010 Primary Sulfur Dioxide NAAQS (August 3, 2012)