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National Ambient Air Quality Standards (NAAQS)

Nitrogen Dioxide (NO2) and Sulfur Dioxide (SO2) Secondary Standards -
Documents from Review Completed in 2012 -

Information provided for informational purposes only Note: EPA no longer updates this information, but it may be useful for historical purposes. See the SO2 and NO2 Secondary Standards Home Page for documents from the current review of the SO2 and NO2 Secondary NAAQS.

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File Description File Date File Types
May 2014 Decision on 2012 NOx/SOx NAAQS Rulemaking 5/27/2014 PDF file
86 KB
November 2007 Consent Decree with schedules for SO2 and NO2 primary NAAQS and NO2/SO2 secondary NAAQS reviews 11/19/2007 PDF file
72 KB
Notice of proposed consent decree - request for public comment 09/20/2007 PDF file
80 KB

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