Landfills have many different kinds of gases. Methane makes up about 40 – 60% of it. Most of the rest is CO2, and small amounts of nitrogen, oxygen, sulfur, and contaminants (i.e. radioactive hydrogen gas). The amount of gas from a landfill is vastly different depending on size, whether it is commercial or industrial, and other factors. One example is with Pennsylvania, they have 20 landfill projects that are capturing 30.3 million cubic feet per day of methane. And methane is only half of all gases found in a landfill. http://www.wppsef.org/landfillgas.html
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