2020 National Emissions Inventory (NEI) Technical Support Document (TSD)

  Section 1. Introduction (pdf) (439.79 KB, March 2023)

Section 2. Contents Overview (pdf) (903.43 KB, August 9, 2023)

Section 3. Point Sources (pdf) (541.1 KB, January 2024)

Section 4. Nonroad Equipment (pdf) (350.93 KB, March 2023)

Section 5. Onroad Mobile (pdf) (2.11 MB, March 2023)

Section 6. Nonpoint Overview (pdf) (710.97 KB, March 2023)

Section 7. Wild and Prescribed Fires and Field Burning (pdf) (2.42 MB, March 2023)

Section 8. Biogenics (pdf) (697 KB, March 2023)

Section 9. Agricultural Fertilizer Application (pdf) (1.08 MB, March 2023)

Section 10. Agriculture - Livestock Waste (pdf) (771.75 KB, April 2024)

Section 11. Commercial Marine Vessels (pdf) (297.13 KB, March 2023)

Section 12. Locomotives (pdf) (248.77 KB, March 2023)

Section 13. Oil and Gas Exploration and Production (pdf) (797.98 KB, March 2023)

Section 14.  Portable Fuel Containers (pdf) (300.67 KB, March 2023)

Section 15. Nonpoint Non-Combustion Mercury (pdf) (554.51 KB, April 2023)

Section 16. Agriculture - Crops and Livestock Dust (pdf) (458.48 KB, October 2024)

Section 17. Agricultural Silage (pdf) (366.82 KB, March 2023)

Section 18. Nonpoint Gasoline Distribution (pdf) (649.69 KB, April 2023)

Section 19. Commercial Cooking (pdf) (401.43 KB, March 2023)

Section 20. Dust - Construction: Residential (pdf) (465.58 KB, April 2023)

Section 21. Dust - Construction: Nonresidential  (pdf) (433.57 KB, April 2023)

Section 22. Dust - Construction: Road (pdf) (416.1 KB, April 2023)

Section 23. Dust - Paved Roads (pdf) (321.55 KB, March 2023)

Section 24. Dust - Unpaved Roads (pdf) (375.55 KB, March 2023)

Section 25. Fuel Combustion - Nonpoint Industrial and Commercial/Institutional Boilers and Internal Combustion Engines (pdf) (554.79 KB, March 2023)

Section 26. Fuel Combustion - Residential Heating: Natural Gas, Oil and Other (pdf) (444.61 KB, March 2023)

Section 27. Fuel Combustion - Residential Wood (pdf) (559.1 KB, April 2023)

Section 28. Industrial Processes- Mining and Quarrying (pdf) (436.19 KB, March 2023)

Section 29. Miscellaneous Non-industrial NEC - Cremation: Human and Animal (pdf) (456.12 KB, April 2024)

Section 30. Miscellaneous Non-industrial NEC - Residential Charcoal Grilling (pdf) (416.31 KB, April 2023)

Section 31. Asphalt Paving (pdf) (404.6 KB, March 2023)

Section 32. All Other Solvents (pdf) (462.91 KB, March 2023)

Section 33. Waste Disposal - Composting (pdf) (444.74 KB, April 2023)

Section 34. Waste Disposal - Open Burning: Landclearing Debris (pdf) (500.84 KB, April 2023)

Section 35. Waste Disposal - Open Burning: Residential Household Waste (pdf) (388.05 KB, March 2023)

Section 36. Waste Disposal - Open Burning: Yard Waste (pdf) (407.93 KB, April 2023)

Section 37. Waste Disposal - Nonpoint Publicly Owned Treatment Works (pdf) (357.99 KB, April 2023)

Appendix. 2020 NEI Errata (pdf) (417.16 KB, April 2025)