Sources
- United States Environmental Protection Agency (EPA)
- Empirical Model Database
- Dartmouth University
- National Archive of Criminal Justice Data (NACJD), Federal Bureau of Investigation (FBI)
- Economic Research Service (ERS), U.S. Department of Agriculture (USDA)
- Satellite-derived PM2.5, Atmospheric Composition Analysis Group, Washington University in St. Louis
- United States Census Bureau TIGER/Line Shapefiles, All Lines shapefile and Cartographic Boundary Files