Fact Sheets and Additional Information Regarding the Primary National Ambient Air Quality Standard (NAAQS) for Sulfur Dioxide

This page contains a fact sheet on the 2019 decision to retain the existing standard, as well as fact sheets and other documents related to the setting of the existing standard in 2010.  This page also contains a pre-publication version of the final decision. 

For more information, visit the SO₂ NAAQS page.

• Fact Sheet: Final Decision Primary National Ambient Air Quality Standard for Sulfur Oxides (pdf) (165.84 KB)
  This fact sheet provides an overview of the decision to retain without revision the 2010 national ambient air quality standard for sulfur oxides.
• Fact Sheet: Revisions to the Primary National Ambient Air Quality Standard (NAAQS) Monitoring Network, and Data Reporting Requirements for Sulfur Dioxide (SO2) (pdf) (40.95 KB, June 2, 2010)
  This fact sheet provides an overview of the 2010 revisions to the primary NAAQS for SO2, as well as revisions to the Monitoring Network and Data Reporting Requirements for SO2.
• Revisions to the Primary National Ambient Air Quality Standard (NAAQS), Monitoring Network and Data Reporting Requirements for Sulfur Dioxide (SO2) (pdf) (197.06 KB, June 2010)
  This presentation provides an overview of the 2010 Primary NAAQS for SO2, as well as revisions to the Monitoring Network and Data Reporting Requirements for SO2.