Our Summary of Data document has detailed descriptions on available data. Most of the data are available for Philadelphia and surrounding counties and measures have been aggregated to census tract.

This map will allow you to see what the local prevalence of elevated lead tests has been in the 34 states where we obtained census tract or zip code level data. The CDC estimates that nationwide ...

The tool has data from every census tract in the country. Choctaw County, in Alabama’s Black Belt region, had the highest level of carbon dioxide emissions per capita in the state in 2023 ...