NO2 Nitrogen Dioxide Air Standard Review Schedule

US EPA has published its anticipated schedule for the next 5-year review of the NO2 National Ambient Air Quality Standard (NAAQS). The review cycle initiated in March 2012 and is anticipated to be completed by January 2016.

The last review of the NO2 primary (health-based) NAAQS was completed in January 2010, with the final decision published in the Federal Register in February 2010. In that decision, EPA added a new 1-hour NO2 standard, with a level of 100 ppb, to the existing annual standard, with a level of 53 ppb. The Clean Air Act establishes a 5-year review cycle for all NAAQS.


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