States and tribes should refer to the following guidance for area designations for the 2015 Ozone NAAQS when preparing their recommendations on area designations.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
EPA Guidance on the Area Designations for the 2015 Ozone National Ambient Air Quality Standards (PDF)(26 pp, 9 MB)
This guidance provides information on the schedule and process for initially designating areas for the purpose of implementing the 2015 primary and secondary ozone national ambient air quality standards.
Guidance to Regions for Working with Tribes during the National Ambient Air Quality Standards (NAAQS) Designations Process (PDF)(10 pp, 713 K)
This memorandum provides guidance to EPA Regional Offices for working with federally-recognized Indian tribes regarding the Clean Air Act section 107(d) designations process for Indian country.
Policy for Establishing Separate Air Quality Designations for Areas of Indian Country (PDF)(16 pp, 1 MB)
This memorandum provides EPAs policy regarding designating areas of Indian country separately from adjacent areas for the National Ambient Air Quality Standards, when requested by the relevant tribe for a particular area of Indian country.