Fig. 3From: A risk-based model to assess environmental justice and coronary heart disease burden from traffic-related air pollutantsDistribution of EJ census tracts along the exposure continuum of black carbon (a) and nitrogen dioxide (b) in Allegheny County. Average long-term exposure estimates for each pollutant were derived for each census tract in the county following land-use regression as described in Methods. Based on the resulting exposure metric, tracts are ranked from lowest to highest exposure and those designated as EJ sensitive are displayed in redBack to article page