Air Quality Conformity Boundaries

The TPB is responsible for the air quality beyond its own metropolitan planning area. This area (shown below) which includes Charles and Calvert Counties in Maryland and Stafford County in Virginia, comprises the Washington Metropolitan Statistical Area (MSA), and has been designated an air quality "marginal non-attainment area" for its failure to meet federal ozone standards. It is this area that is the focus of air quality plans developed for the region.