The essence of the transportation conformity is that, in non-attainment and maintenance areas, transportation plans and programs, which are financed wholly or partly with Federal-aid, will not further degrade air quality. Air Quality Conformity ensures that the Birmingham MPO's transportation plans and programs are within the acceptable limits placed on mobile source air pollutants as identified in the State of Alabama's air quality State Implementation Plan (SIP). Since April 2005, the Birmingham metropolitan planning area (Jefferson and Shelby with a small portion of Walker County) has been designated as an air quality non-attainment area with respect to the NAAQS for particulate matter smaller than 2.5 microns in diameter, abbreviated PM2.5. The planning area is designated as a maintenance area for ground-level ozone. Non-attainment areas are the regions identified by the Environmental Protection Agency (EPA) as exceeding National Ambient Air Quality Standards (NAAQS). Compliance with EPA air quality requirements is mandatory for non-attainment or maintenance areas.
Air Quality Reports
- 2009 Air Quality Conformity Determination Report for 2035 RTP + Updated 2008-2011 TIP - June, 2010 (5MB)
- Air Quality Conformity Determination Report for 24-hour PM2.5 Standard - Adopted December, 2010 (5MB)
- Air Quality Conformity Determination (AQCD) Report Final - for amended 2035 RTP + 2012-2015 TIP, adopted September 2011
- Air Quality Conformity Determination report final - adopted November 2012(5MB)
- Conformity Determination, Final Report - November, 2008 (17MB)