Which one of the following gases is released mostly from landfills in urban areas ........

Geography (CDS) Environment

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Which one of the following gases is released mostly from landfills in urban areas?

Nitrogen

Hydrogen

Methane

Oxygen

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Explanation:

Decomposing waste in the landfills, by the action of microorganisms, produce methane and carbon dioxide. Landfill gas consists of 40- 60% of methane and rest is carbon dioxide. Trace amount of volatile organic compounds (<1) are also present which mainly comprise of hydrocarbons.