Citation

Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS). Federal Highway Administration, Office of Planning, HEPP-1. United States Non-Attainment Areas: Particulate Matter 10, 2008. [Shapefile]. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS). Retrieved from https://earthworks.stanford.edu/catalog/sde-columbia-ntad_2008_naa_ma_pm10