On June 2, 2010, EPA strengthened the primary National Ambient Air Quality Standard (NAAQS) for sulfur dioxide (SO2).
This page contains a variety of fact sheets and other documents describing that action.
For more information, visit the 2010 SO2 NAAQS page.
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.-
Fact Sheet: Revisions to the Primary National Ambient Air Quality Standard (NAAQS) Monitoring Network, and Data Reporting Requirements for Sulfur Dioxide (SO2) (PDF)(6 pp, 42 K,
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.
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Revisions to the Primary National Ambient Air Quality Standard (NAAQS), Monitoring Network and Data Reporting Requirements for Sulfur Dioxide (SO2) (PDF)(21 pp, 202 K,
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.
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Counties with Monitors Violating the Revised Primary 1-Hour Sulfur Dioxide (SO2) Standard of 75 ppb, Based on 2007-2009 Data (PDF)(1 pg, 82 K,
June 15, 2010)
This is a 2010 map of counties in the United States that do not meet the revised primary 1-hour sulfur dioxide standard based on 2007-2009 data.
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Design Values (1-Hour) by County for Revised Primary Sulfur Dioxide Standard (PDF)(6 pp, 61 K,
Jun 2010)
This is a 2010 table of counties in the United States with their 2007-2009 design values for the revised 1-hour SO2 standard of 75 ppb.
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Counties with Monitors Projected to Violate the Revised Primary 1-Hour Sulfur Dioxide (SO2) Standard in 2020 (PDF)(1 pg, 34 K,
June 15, 2010)
This is a 2010 map of counties in the United States projected to meet the revised primary 1-hour sulfur dioxide (SO2) standard of 75ppb in 2020.
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2020 Projected Design Values (1-Hour) by County for Sulfur Dioxide (SO2) (PDF)(6 pp, 61 K,
June 2010)
This is a 2010 table of counties in the United States and their projected 2020 design values for the revised 1-hour SO2 standard of 75 ppb.