December 18, 2014 - After considering state and tribal recommendations, reviewing the most recent certified fine particle air quality data, and emissions that contribute fine particle pollution, EPA has completed initial designations for the 2012 annual fine particle standard.

• Federal Register Notice Detailing Boundaries for Area Designations (PDF)(80 pp, 657 K, About PDF) - January 15, 2016

• Fact Sheet (PDF)(4 pp, 145 K)
• Map Showing Designated and Deferred Areas (PDF)(1 pg, 151 K)
• Responses to Significant Comments document (PDF)(68 pp, 623 K)