The EPA provides emissions maps in two ways. First, each of the last three NEI years have a “Facility Mapping” tab available on the main NEI page for that inventory year (for example, see the 2014 NEI page). With this tool, maps can be created for one state at a time. In addition, the facility-total data are available for each inventory in a summary file that is posted on the “Data Summaries” tab of each inventory page, and users can download the CSV data for import to Geographic Information System tools.
In addition, for the latest NEI available, an advanced mapping feature is available as part of the online interactive NEI Report. You can also access the data part of the report by going directly to the Point Source Dashboard. The tools on this site allow for mapping the entire U.S. for all criteria pollutants and precursors as well as for a selection of hazardous air pollutants.