Fact Sheets and Additional Information Regarding the Primary National Ambient Air Quality Standards (NAAQS) for Nitrogen Dioxide (NO2)

This page contains a fact sheet on the 2018 decision to retain the existing standards, and also fact sheets and additional information related to the setting of the existing standards in 2010.

• Primary National Ambient Air Quality Standards (NAAQS) for Nitrogen Dioxide: Fact Sheet (pdf) (628.95 KB, April 6, 2018)
• Fact Sheet: Proposed Decision to Retain the Primary National Ambient Air Quality Standards of Oxides of Nitrogen (pdf) (124.01 KB, July, 2017)
• Fact Sheet: Final Revisions to the National Ambient Air Quality Standards for Nitrogen Dioxide (pdf) (34.23 KB, January 22, 2010)
  This fact sheet provides an overview of the 2010 revisions to the primary NAAQS for NO2.
• Final Revisions to the Primary National Ambient Air Quality Standard (NAAQS) for Nitrogen Dioxide (pdf) (187.62 KB, January 2010)
  This presentation provides an overview of the 2010 Primary NAAQS for NO2
• Design Values (Average 1-Hour 98th percentiles over 3 years) by County for Nitrogen Dioxide (pdf) (43.6 KB, January 2010)
  This is a 2010 table of counties in the United States with their 2006-2008 design values for the revised 1-hour NO2 standard of 100 ppb.
• Final Regulatory Impact Analysis (RIA) for the 2010 NO2 National Ambient Air Quality Standards (NAAQS) (pdf) (2.54 MB, January 2010)