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Nitrogen Dioxide Designations

2010 Nitrogen Dioxide Standards — Region 9 Recommendations and EPA Responses

States submitted recommendations to EPA for nitrogen dioxide (NO2) attainment and nonattainment areas in 2011. Some states submitted additional recommendations in 2010 based on more recent or new monitoring data.

State area designations for the 2010 NO2 air quality standards are summarized here.

Tribal information is available on the Tribal Recommendations page.

EPA's Final Designations

All areas have been designated as unclassifiable/attainment.

Recommendation Documents

You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.

The documents listed below are state and tribe responses to EPA's request for recommendations on the designation of areas for the NO2 standard and EPA's responses to those submittals. These responses are provided here in PDF format for INFORMATIONAL PURPOSES ONLY and do not represent EPA's views on the appropriateness or adequacy of a state's or a tribe's recommendations.

The quality of these PDF files is quite variable and is the result of the quality of the documents provided by the states.

Recommendations received by EPA Region 9

State State's
Recommendation

EPA Response

State Remarks on EPA
Response
American Samoa Letter (PDF) (1 pp, 432KB)
Letter (PDF) (2 pp, 1.1MB)
 
Arizona Letter (PDF) (2 pp, 64KB)
Letter (PDF) (2 pp, 1.1MB)
 
California

Letter (PDF) (9 pp, 224KB)
Attachment (PDF) (9 pp, 228KB)
Attachment (PDF) (7 pp, 32KB)
Attachment (PDF) (2 pp, 12KB)

Letter (PDF) (2 pp, 1.2MB)  
Guam Letter (PDF) (x pp, xxKB) Letter (PDF) (2 pp, 1.0MB)  
Hawaii Letter (PDF) (3 pp, 136KB) Letter (PDF) (2 pp, 1.1MB)  
Nevada Letter (PDF) (2 pp, 140KB) Letter (PDF) (2 pp, 1.1MB)  
Northern Mariana Islands Letter (PDF) (x pp, xxKB) Letter (PDF) (2 pp, 1.1MB)  

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