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Clean Diesel Versus CNG Buses: Cost, Air Quality, & Climate Impacts

February 3, 2012
Publication Cover

The purpose of the analysis was to evaluate the potential for life-cycle cost savings to transit agencies from the purchase of new CNG buses instead of new diesel buses, as well as the impact of CNG bus purchases on fleet-wide criteria pollutant and greenhouse gas (GHG) emissions. The analysis of GHG emissions includes both tail-pipe emissions and upstream emissions from production and transport of fuel. The analysis also includes the climate impact of the black carbon portion of tail-pipe PM emissions.