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1. Revised Nitrogen Dioxide (1971 Standard) Designation Notices
    
   1. Final Air Quality Designations for the 2010 Primary Nitrogen Dioxide (NO₂) NAAQS (February 17, 2012)
      See 77 FR 9532
   
   
   2. Proposed Technical Amendments to Inadvertent Errors in Air Quality Designations for Fine Particles, Ozone, Lead, Nitrogen Dioxide, and Sulfur Dioxide (May 5, 2014)
      See 79 FR 25555
   
   
   3. Final Technical Amendments to Inadvertent Errors in Air Quality Designations for Fine Particles, Ozone, Lead, Nitrogen Dioxide, and Sulfur Dioxide (May 5, 2014)
      See 79 FR 25508