The following documents are Agency non-binding guidance documents relating to the implementation of the 2010 1-Hour Sulfur Dioxide (SO2) Primary National Ambient Air Quality Standards (NAAQS).

• Updated Guidance for Area Designations for the 2010 Primary Sulfur Dioxide (SO₂) National Ambient Air Quality Standards (NAAQS)

• Guidance for 1-Hour Sulfur Dioxide (SO₂) Nonattainment Area State Implementation Plans (SIP) Submissions

For regulatory information, see the  Final Data Requirements Rule for the 2010 1-Hour Sulfur Dioxide (SO₂) Primary National Ambient Air Quality Standards (NAAQS) Fact Sheet and Webinar Slides

• SO₂ Data Requirements Rule Source List