Multi-Jurisdictional (Complex) Areas

The boundaries of a metropolitan planning organization (MPO) do not always correspond to the nonattainment or maintenance area boundary, nor does a nonattainment or maintenance area always contain a single MPO. In addition, a nonattainment or maintenance area boundary may encompass portions of more than one state. Also, there may be some portion of the nonattainment or maintenance area that is not included in any MPO's planning area. The following documents provide information about transportation conformity issues related to these multi-jurisdictional areas.

Research

Transportation Conformity Practices in Complex Areas - FHWA conducted an assessment of how conformity determinations and regional emissions analyses are being done in the different types of complex nonattainment and maintenance areas

PDF files can be viewed with the Acrobat® Reader®