From: Current practices in spatial analysis of cancer data: data characteristics and data sources for geographic studies of cancer
Dataset name
Source Agency
URL
Geographic Resolution
Air Quality System database
EPA
http://www.epa.gov/air/data/aqsdb.html
Monitoring stations (latitude, longitude)
National Emissions Inventory
http://www.epa.gov/air/data/neidb.html
Varies (point locations, county level)