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Nitrogen Oxide Uncontrolled Emission Factors                      
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Table A2.Nitrogen Oxide Uncontrolled Emission Factors
(Units and Factors)
Fuel, Code, Source, and Emission Units Combustion System Type/Firing Configuration
Factors for Wet-Bottom Boilers are in Brackets; All Other Boiler Factors are for Dry-Bottom
Fuel And EIA
Fuel Code		 Source and Tables 
(As appropriate)		 Emissions Units (Lbs = pounds, MMCF = million cubic feet, MG = thousand gallons) Cyclone Boiler Fluidized Bed Boiler Opposed Firing Boiler Spreader Stoker Boiler Tangential Boiler All Other Boiler Types Combustion Turbine Internal Combustion Engine
Agricultural Byproducts (AB) Source: 1 Lbs per ton  1.2 1.2 1.2 1.2 1.2 1.2 NA NA
Blast Furnace Gas (BFG) Sources: 1 (including footnote 7 within source);  EIA estimates Lbs per MMCF 15.4 15.4 15.4 15.4 15.4 15.4 30.4 256.55
Bituminous Coal (BIT) Source: 2, Table 1.1-3 Lbs per ton  33 5 12 [31] 11 10.0 [14.0] 12.0 [31.0] NA NA
Black Liquor (BLQ) Source: 1 Lbs per ton  ** 1.5 1.5 1.5 1.5 1.5 1.5 NA NA
Distillate Fuel Oil (DFO) Source: 2, Tables 3.4-1 & 1.3-1 Lbs per MG 24 24 24 24 24 24 122 443.8
Jet Fuel (JF) Source: 2, Tables 3.1-2a, 3.4-1 & 1.3-1 Lbs per MG 24 24 24 24 24 24 118 432
Kerosene (KER) Source: 2, Tables 3.1-2a, 3.4-1 & 1.3-1 Lbs per MG 24 24 24 24 24 24 118 432
Landfill Gas (LFG) Sources: 1 (including footnote 7 within source);  EIA estimates Lbs per MMCF 72.44 72.44 72.44 72.44 72.44 72.44 144 1215.22
Lignite Coal (LIG) Source: 2, Table 1.7-1 Lbs per ton  15 3.6 6.3 5.8 7.1 6.3 NA NA
Municipal Solid Waste (MSW) Source: 1 Lbs per ton  5 5 5 5 5 5 NA NA
Natural Gas (NG) Source: 2, Tables 1.4-1, 3.1-1, and 3.4-1 Lbs per MMCF 280 280 280 280 170 280 328 2768
Other Biomass Gas (OBG) Sources: 1 (including footnote 7 within source);  EIA estimates Lbs per MMCF 112.83 112.83 112.83 112.83 112.83 112.83 313.6 2646.48
Other Biomass Liquids (OBL) Source: 1 (including footnote 3 within source) Lbs per MG 19 19 19 19 19 19 NA NA
Other Biomass Solids (OBS) Source: 1 (including footnote 11 within source) Lbs per ton  2 2 2 2 2 2 NA NA
Other Gases (OG) Sources: 1 (including footnote 7 within source);  EIA estimates Lbs per MMCF 152.82 152.82 152.82 152.82 152.82 152.82 263.82 2226.41
Other (OTH) Assumed to have emissions similar to natural gas. Lbs per MMCF 280 280 280 280 170 280 328 2768
Petroleum Coke (PC) Source: 1 (including footnote 8 within source) Lbs per ton  21 5 21 21 21 21 NA NA
Propane Gas (PG) Sources: 3;  EIA estimates Lbs per MMCF 215 215 215 215 215 215 330.75 2791.22
Residual Fuel Oil (RFO) Source: 2, Table 1.3-1 Lbs per MG 47 47 47 47 32 47 NA NA
Synthetic Coal (SC) Assumed to have emissions similar to Bituminous Coal. Lbs per ton  33 5 12 [31] 11 10.0 [14.0] 12.0 [31.0] NA NA
Sludge Waste (SLW) Source: 1 (including footnote 11 within source) Lbs per ton ** 5 5 5 5 5 5 NA NA
Subbituminous Coal (SUB) Source: 2, Table 1.1-3 Lbs per ton   17 5 7.4 [24] 8.8 7.2 7.4 [24.0] NA NA
Tire-Derived Fuel (TDF) Source: 1 (including footnote 13 within source) Lbs per ton  33 5 12 [31] 11 10.0 [14.0] 12.0 [31.0] NA NA
Waste Coal (WC) Source: 1  (including footnote 20 within source) Lbs per ton  15 3.6 6.3 5.8 7.1 6.3 NA NA
Wood Waste Liquids (WDL) Source: 1 (including footnote 16 within source) Lbs per MG 5.43 5.43 5.43 5.43 5.43 5.43 NA NA
Wood Waste Solids (WDS) Source: 1 Lbs per ton  2.51 2 2.51 1.5 2.51 2.51 NA NA
Waste Oil (WO) Source: 2, Table 1.11-2 Lbs per MG 19 19 19 19 19 19 NA NA
  Note: ** Although Sludge Waste and Black Liquor consist substantially of liquids, these fuels are measured and reported to EIA in tons.
  Sources: Eastern Research Group, Inc. and E.H. Pechan & Associates, Inc., Documentation for the 2002 Electric Generating Unit National Emissions Inventory, Table 6, September 2004.  Prepared for the U.S. Environmental Protection Agency, Emission Factor and Inventory Group (D205-01), Emissions, Monitoring and Analysis Division, Research Triangle Park; U.S. Environmental Protection Agency, AP 42, Fifth Edition (Compilation of Air Pollutant Emission Factors, Volume 1: Stationary Point and Area Sources); available at: http://www.epa.gov/ttn/chief/ap42/; and U.S. Environmental Protection Agency, Factor Information Retrieval (FIRE) Database, Version 6.25; available at: http://www.epa.gov/ttn/chief/software/fire/index.html

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