LFG contains

Typical Landfill Gas Components:

Component
Percent by Volume
Characteristics
methane
45–60
Methane is a naturally occurring gas. It is colorless and odorless. Landfills are the single largest source of man-made methane emissions.
carbon dioxide
40–60
Carbon dioxide is naturally found at small concentrations in the atmosphere (0.03%). It is colorless, odorless, and slightly acidic.
nitrogen
2–5
Nitrogen comprises approximately 79% of the atmosphere. It is odorless, tasteless, and colorless.
oxygen
0.1–1
Oxygen comprises approximately 21% of the atmosphere. It is odorless, tasteless, and colorless.
ammonia
0.1–1
Ammonia is a colorless gas with a pungent odor.
NMOCs (non-methane organic compounds)
0.01–0.6
NMOCs are organic compounds (i.e., compounds that contain carbon). (Methane is an organic compound but is not considered an NMOC.) NMOCs may occur naturally or be formed by synthetic chemical processes. NMOCs most commonly found in landfills include acrylonitrile, benzene, 1,1-dichloroethane, 1,2-cis dichloroethylene, dichloromethane, carbonyl sulfide, ethyl-benzene, hexane, methyl ethyl ketone, tetrachloroethylene, toluene, trichloroethylene, vinyl chloride, and xylenes.
sulfides
0–1
Sulfides (e.g., hydrogen sulfide, dimethyl sulfide, mercaptans) are naturally occurring gases that give the landfill gas mixture its rotten-egg smell. Sulfides can cause unpleasant odors even at very low concentrations.
hydrogen
0–0.2
Hydrogen is an odorless, colorless gas.
carbon monoxide
0–0.2
Carbon monoxide is an odorless, colorless gas.

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