March 31, 2015 - EPA is establishing or revising initial area designations and a technical amendment to correct an inadvertent error in the initial designation for one area for the 2012 annual national ambient air quality standards for fine particle pollution. 

• Federal Register Notice (PDF)(17 pp, 289 K, About PDF) - April 7, 2015

• Fact Sheet (PDF)(3 pp, 110 K)
• Map Showing Designated and Deferred Areas (PDF)(1 pg, 71 K)