Nitrogen dioxide designations - State recommendation and EPA response for Washington, D.C.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- Washington, D.C State Recommendation (PDF)(2 pp, 803 K, January 20, 2011)
- EPA Response to Washington, D.C. Recommendation (PDF)(2 pp, 82 K, June 29, 2011)