| Biogas is a mixture of methane and other gases produced from the natural decomposition of organic materials in landfills. Biomethane is a pipeline-quality natural gas substitute that is produced by purifying biogas. Converting the methane that leaks from landfills to biomethane has significant greenhouse gas reduction benefits. In addition, there's a 100% displacement of fossil fuels as biomethane is a renewable resource. When combusted, biomethane has reduced NOx, PM, and greenhouse gas emissions. Cummins Westport approves the use of up to 100% biomethane that meets Cummins published standard natural gas fuel specifications. See the Cummins Westport Technical Bulletin on Biogas or Biomethane Fuel Use  for more detail.For more information: Visit http://www.ngvamerica.org/pdfs/BiomethaneFactSheet.pdf .View The use of biomethane as a fuel by the urban bus fleet in Lille (France) (5MB) by Dr. Mestrel Consultancy & Associates (Paris, Zurich, Stockholm): Safe & Sustainable Urban transportation systems expertise.
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