Air Quality Conformity

What is the relationship between transportation and air quality?

Usage of the transportation system is an influential factor in a region’s air quality. Therefore, the estimated emission of pollutants from motor vehicles is a key consideration in transportation planning. Regions that have nonattainment or maintenance air quality status are required to ensure that emissions from transportation investments are consistent, or in conformity with, levels set forth in state air quality plans. Therefore, state DOTs and MPOs need to have a clear understanding of the air quality-related transportation planning requirements.

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