Combustion - Gas Fuels

Combustion of gaseous fuels (natural gas, digester gas, and landfill gas) in boilers, engines, turbines, flares, and other miscellaneous combustion devices results in the release of several criteria pollutants and toxic air contaminants to the atmosphere. Emissions typically include NOx, SOx, ROG, PM, CO, benzene, toluene, formaldehyde, xylenes, and other trace substances. Most emission factors are derived from source test results. This testing may include the speciation of nonmethane organic compounds and particulate matter in the stack gas exhaust. Factors can also be derived by applying an average destruction efficiency to combustible components of the gaseous fuel. A combination of both techniques has been used for equipment fired with digester gas and landfill gas. 

Learn more

Emission Factor Tables

Boilers, Natural Gas Fired, 100+ MMBTU/hr, Pre-NSPS, No Controls

Boilers, Natural Gas Fired, 100+ MMBTU/hr, Post-NSPS, No Controls

Boilers, Natural Gas Fired, 100+ MMBTU/hr, Low NOx.Burners

Boilers, Natural Gas Fired, 100+ MMBTU/hr, Flue Gas Recirculation

Boilers, Natural Gas Fired, 0.3-100 MMBTU/hr, No Controls

Boilers, Natural Gas Fired, 0.3-100 MMBTU/hr, Low NOx Burners

Boilers, Natural Gas Fired, 0.3-100 MMBTU/hr, Flue Gas Recirculation

Boilers, Natural Gas Fired, Tangential Fired, No Controls

Boilers, Natural Gas Fired, Tangential Fired, Flue Gas Recirculation

Boilers, Natural Gas Fired, 0.0-0.3 MMBTU/hr, No Controls

Boilers, Digester Gas Fired, No Controls

Engines, Natural Gas Fired, 2 Cycle, Lean Burn, No Controls

Engines, Natural Gas Fired, 2 Cycle, Lean Burn, with Selective Catalytic Reduction (SCR)

Engines, Natural Gas Fired, 2 Cycle, Lean Burn, with Catalytic Oxidation

Engines, Natural Gas Fired, 4 Cycle, Lean Burn, No Controls

Engines, Natural Gas Fired, 4 Cycle, Lean Burn with Selective Catalytic Reduction (SCR)

Engines, Natural Gas Fired, 4 Cycle, Lean Burn with Catalytic Oxidation

Engines, Natural Gas Fired, 4 Cycle, Rich Burn, No Controls

Engines, Natural Gas Fired, 4 Cycle, Rich Burn with Non-Selective Catalytic Reduction (NSCR)

Engines, Digester Gas Fired, No Controls

Engines, Landfill Gas Fired

Flares, Enclosed, Digester Gas Fired

Flares, Enclosed, Landfill Gas Fired

Miscellaneous External Combustion Equipment,  Natural Gas Fired, 0.0-0.3 MMBTU/hr

Turbines, Natural Gas Fired, All Sizes,  No Controls

Turbines, Natural Gas Fired, All Sizes, with Water Injection

Turbines, Natural Gas Fired, All Sizes, with Water Injection & Selective Catalytic Reduction (SCR)

Turbines, Natural Gas Fired, All Sizes, with Lean-Premix

Turbines, Landfill Gas Fired, All Sizes

Turbines, Digester Gas Fired, All Sizes