CNG buses also require elaborate specialized fueling and maintenance facilities because of the dangers posed by natural gas explosions. Going the CNG route now also means adding a third fueling system on top of existing diesel and future hydrogen for fuel cells. The clean diesel option is the best option for the interim period on the way to fuel cell technology, and it gets you there two years earlier than with the alternatives. With very low sulfur fuels and the latest exhaust treatment systems proposed here in the diesel path, clean diesel will actually emit less hydrocarbons, nitrogen oxides, and carbon dioxide than CNG, and just about the same level of particulates. The VTA goals can be met with funds remaining to purchase more modern clean diesel buses to improve and upgrade service and provide other direct benefits to transit riders.
Clean diesel provides the best balance between public health and the public pocketbook.
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