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

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
Responses to Significant Comments on the 2011 Proposed Rule on the Secondary National Ambient Air Quality Standards for Oxides of Nitrogen and Oxides of Sulfur (August 1, 2011; 76 FR 46084) 03/20/2012 PDF file
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