What is the primary purpose of landfill gas collection systems at modern landfills?

• A. Capture methane and other gases for flare or energy recovery; monitor odors and emissions.
• B. Increase air emissions by venting methane to atmosphere.
• C. Replace all other waste management practices.
• D. Eliminate all odors without capturing any gas.

Answer: (A)

Landfill gas collection systems are meant to capture the gases produced as waste decomposes anaerobically, mainly methane and carbon dioxide, so they can be burned off or used for energy. This reduces greenhouse gas emissions and also helps control odors and monitor emissions to protect air quality. Venting methane to the atmosphere would worsen climate and odor problems, so that option isn’t desirable. The system isn’t about replacing all waste practices or eliminating odors without gas capture—the key purpose is to manage the gas produced and, when possible, turn it into a useful energy source.