Emission Components







Green House Gas Potential Relative to CO2

CO2 (Carbon dioxide)

Complete combustion of carbon in fuel

Global Warming


CO (Carbon Monoxide)

Incomplete combustion of carbon in fuel


SO2 (Sulphur Dioxide)

Combustion of sulphur in fuel (Sulphur is NOT a component of natural gas)

Smog, Acid Rain

NOx (Nitrous Oxide)

By-product of most combustion processes

Acid Rain

N2O (Nitrous Oxide)

By-product of some combustion processes

Global Warming


VOCs (Volatile Organic Compounds)

Leakage and evaporation of liquid fuels


CH4 (Methane)

Natural Gas Leaks

Global Warming


H2O (Water Vapor)

Hydrogen in fuel mixing with oxygen in the combustion process

Localized Fog

Particulates (Dust, Soot, Fumes)

Unburned carbon from fuel, including ash and dirt

Smog, Respiratory Hazard

Trace Elements

Impurities in fuel

Unknown and Potential Carcinogens

Halogenated and Chlorinated Compounds

Compounds in fuel or combustion air containing halogens (Chlorine, fluorine, bromine and iodine)

Potential carcinogens, Global Warming


For a complete discussion about NOx, NOx Control and low-NOx Equipment, see Boiler Emissions Workshop

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