2.1 What are EIS sectors?
First used for the 2008 NEI, EIS Sectors continue to be used for all 2020 NEI data categories. The sectors were developed to better group emissions for both CAP and HAP summary purposes. The sectors are based simply on grouping the emissions by the emissions process as indicated by the SCC to an EIS sector. In building this list, we gave consideration not only to the types of emissions sources our data users most frequently ask for, but also to the need to have a relatively concise list in which all sectors have a significant amount of emissions of at least one pollutant. The SCC-EIS Sector cross-walk used for the summaries provided in this document is available for download from the “Source Classification Codes (SCCs) website”. No changes were made to the SCC-mapping or sectors used for the 2020 NEI except where SCCs were retired, or new SCCs were added.
Some of the sectors include the nomenclature “NEC,” which stands for “not elsewhere classified.” This simply means that those emissions processes were not appropriate to include in another EIS sector and their emissions were too small individually to include as its own EIS sector.
Since the 2008 NEI, the inventory had been reported and compiled in EIS using five major data categories: point, nonpoint, onroad, nonroad and events. The event category was used to compile day-specific data from prescribed burning and wildfires. While events could be other intermittent releases such as chemical spills and structure fires, prescribed burning and wildfires had been a focus of the NEI creation effort and were the only emission sources contained in the event data category.
For the 2020 NEI, we have aggregated the wildfires and prescribed burning emissions into county-level estimates and loaded these into the nonpoint data category. Table 2 1 shows the EIS sectors or source category component of the EIS sector in the left most column. EIS data categories -Point, Nonpoint, Onroad, Nonroad, and Events- that have emissions in these sectors/source categories are also reflected. As Table 2 1 illustrates, many EIS sectors include emissions from more than one EIS data category because the EIS sectors are compiled based on the type of emissions sources rather than the data category. Note that the emissions summary sector “Mobile – Aircraft” is reported partly to the point and partly to the nonpoint data categories and “Mobile – Commercial Marine Vessels” and “Mobile – Locomotives” are reported to the nonpoint data category. NEI users who aggregate emissions by EIS data category rather than EIS sector should be aware that these changes will give differences from historical summaries of “nonpoint” and “nonroad” data unless care is taken to assign those emissions to the historical grouping.
As Table 2.1 illustrates, many EIS sectors include emissions from more than one EIS data category because the EIS sectors are compiled based on the type of emissions sources rather than the data category. Note that the emissions summary sector “Mobile – Aircraft” is reported partly to the point and partly to the nonpoint data categories and “Mobile – Commercial Marine Vessels” and “Mobile – Locomotives” are reported to the nonpoint data category. NEI users who aggregate emissions by EIS data category rather than EIS sector should be aware that these changes will give differences from historical summaries of “nonpoint” and “nonroad” data unless care is taken to assign those emissions to the historical grouping.
| Component EIS Sector or EIS Sector: Source Category Name | Point | Nonpoint | Onroad | Nonroad |
|---|---|---|---|---|
| Agriculture - Crops & Livestock Dust | X | |||
| Agriculture - Fertilizer Application | X | |||
| Agriculture - Livestock Waste | X | X | ||
| Biogenics - Vegetation and Soil | X | |||
| Bulk Gasoline Terminals | X | X | ||
| Commercial Cooking | X | |||
| Dust - Construction Dust | X | X | ||
| Dust - Paved Road Dust | X | |||
| Dust - Unpaved Road Dust | X | |||
| Fires - Agricultural Field Burning | X | |||
| Fires - Prescribed Burning | X | |||
| Fires - Wildfires | X | |||
| Fuel Comb - Comm/Institutional - Biomass | X | X | ||
| Fuel Comb - Comm/Institutional - Coal | X | X | ||
| Fuel Comb - Comm/Institutional - Natural Gas | X | X | ||
| Fuel Comb - Comm/Institutional - Oil | X | X | ||
| Fuel Comb - Comm/Institutional - Other | X | X | ||
| Fuel Comb - Electric Generation - Biomass | X | |||
| Fuel Comb - Electric Generation - Coal | X | |||
| Fuel Comb - Electric Generation - Natural Gas | X | |||
| Fuel Comb - Electric Generation - Oil | X | |||
| Fuel Comb - Electric Generation - Other | X | |||
| Fuel Comb - Industrial Boilers, ICEs - Biomass | X | X | ||
| Fuel Comb - Industrial Boilers, ICEs - Coal | X | X | ||
| Fuel Comb - Industrial Boilers, ICEs - Natural Gas | X | X | ||
| Fuel Comb - Industrial Boilers, ICEs - Oil | X | X | ||
| Fuel Comb - Industrial Boilers, ICEs - Other | X | X | ||
| Fuel Comb - Residential - Natural Gas | X | |||
| Fuel Comb - Residential - Oil | X | |||
| Fuel Comb - Residential - Other | X | |||
| Fuel Comb - Residential - Wood | X | |||
| Gas Stations | X | X | X | |
| Industrial Processes - Cement Manufacturing | X | |||
| Industrial Processes - Chemical Manufacturing | X | X | ||
| Industrial Processes - Ferrous Metals | X | |||
| Industrial Processes - Mining | X | X | ||
| Industrial Processes - NEC | X | X | ||
| Industrial Processes - Non-ferrous Metals | X | X | ||
| Industrial Processes - Oil & Gas Production | X | X | ||
| Industrial Processes - Petroleum Refineries | X | X | ||
| Industrial Processes - Pulp & Paper | X | |||
| Industrial Processes - Storage and Transfer | X | X | ||
| Miscellaneous Non-Industrial NEC: Residential Charcoal Grilling | X | |||
| Miscellaneous Non-Industrial NEC: Portable Gas Cans | X | |||
| Miscellaneous Non-Industrial NEC: Nonpoint Hg | X | |||
| Miscellaneous Non-Industrial NEC (All other) | X | X | ||
| Mobile – Aircraft | X | |||
| Mobile - Commercial Marine Vessels | X | |||
| Mobile – Locomotives | X | X | ||
| Mobile - NonRoad Equipment – Diesel | X | X | ||
| Mobile - NonRoad Equipment – Gasoline | X | X | ||
| Mobile - NonRoad Equipment – Other | X | X | ||
| Mobile - Onroad – Diesel Heavy Duty Vehicles | X | |||
| Mobile - Onroad – Diesel Light Duty Vehicles | X | |||
| Mobile - Onroad – Gasoline Heavy Duty Vehicles | X | |||
| Mobile - Onroad – Gasoline Light Duty Vehicles | X | |||
| Solvent - Consumer & Commercial Solvent Use: Agricultural Pesticides | X | |||
| Solvent - Consumer & Commercial Solvent Use: Asphalt Paving | X | |||
| Solvent - Consumer & Commercial Solvent Use: All Other Solvents | X | |||
| Solvent - Degreasing | X | X | ||
| Solvent - Dry Cleaning | X | X | ||
| Solvent - Graphic Arts | X | X | ||
| Solvent - Industrial Surface Coating & Solvent Use | X | X | ||
| Solvent - Non-Industrial Surface Coating | X | |||
| Waste Disposal: Open Burning | X | |||
| Waste Disposal: Nonpoint POTWs | X | |||
| Waste Disposal: Human Cremation | X | |||
| Waste Disposal: Nonpoint Hg | X | |||
| Waste Disposal (all remaining sources) | X | X |