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

This memo summarizes the results of an analysis which compares the economic, and the air quality and climate impacts, resulting from the use of compressed natural gas (CNG) transit buses to those from modern diesel buses.

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.

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