The correct option is C; II and III
The gases obtained from a landfill sites are ammonia, hydrogen sulfide, methane, and carbon dioxide.
Of these gases, ammonia and hydrogen sulfide are responsible for the odor at landfill sites.
The odor from burning landfill gas can have deleterious effects on the health of residents owing to its smelly odors.
Also, many air pollutants are produced when the constituents of landfill gas are burnt.
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