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Air Emissions Inventories

2011 National Emissions Inventory (NEI) Data

The data posted at this site will include only the latest version of the 2011 NEI. This webpage should not be used as a reference for past versions of the NEI and users wanting a record of data used in their analysis should archive and document those inventories to meet their own archival needs. Users should not assume that the data posted on this site will stay the same as the data they use at a given point in time.

Sector Summaries - Criteria and Hazardous Air Pollutants by 60 EIS emission sectors

*A complete sector file is provided below under "Additional Summary Data". To use the multiple selection boxes hold CTRL and click on options you would like to include in your query. To select multiples in order, click your first option then hold SHIFT + click the last selection to highlight everything in between. To unselect options use the same method as with selecting. Please allow time for large queries to process (i.e. county aggregated for all pollutants, all regions, selected sector).

National / State / County or Tribe Geographic Aggregation
Pollutant Sector
*Query results will be displayed below.

Tier 1 Summaries - Criteria Air Pollutants only by 14 major tiers

National / State / County or Tribe Geographic Aggregation
Pollutant Tier 1 Category
*Query results will be displayed below.

SCC Data Files

The full detail data files for the Point, Onroad, Nonroad and Nonpoint data categories can be downloaded from the list below. Please note these files are larger than previous inventories and can be linked in Access if importing fails. These SCC data files do not include “events” data -wildfires and prescribed burning emissions. The events data can be found at the “Prescribed/Wildfires by Pollutant” link below under “Other Emissions Summaries”. To obtain a complete inventory total, please include these data in addition to the 4 SCC data files provided here.

Additional Summary Data

Files that can be used for air quality modeling can be found at the Air Emissions Modeling.

Facility Maps & Data

The facility query will provide a map of facilities for a selected state along with tabular data for the selected pollutant(s).  Please note that the map will only display if there are less than 25 pollutants selected.  If more than 25 pollutants are selected then only the tabular data will be displayed.

State Pollutant