So you live very close to a landfill and you smell a rotten-smelling gas occasionally?
You don’t need to be a Sherlock Holmes to guess what this gas could be.
Ten to one, what you are getting is the Landfill Gas.
Landfill gas is essentially biogas. Biogas is generated when organic waste is acted upon by bacteria under conditions of very limited or no supply of air (called anaerobic conditions).
Yes, so the landfill gas is pretty much the same biogas that you get when you use your kitchen and garden waste in a biogas digester.
Landfill gas, similar to biogas you get from other sources, has about 50% methane.
As it has a reasonably good calorific value, if captured and stored in an optimal manner, landfill gas can generate heat (local community heating) or power.
Many landfills already utilize the landfill gas for power generation. At the same time, at quite a few landfills, where the landfill gas generation rates are not high enough, the gas is not captured, and in some other cases, it is just flared (yes, just burnt!).