The synthesis will be of interest to transit agency general managers, as well as operations, maintenance, and planning personnel. It will also be of interest to environmental agency officials, equipment suppliers, consultants, and others concerned with bus operations planning and design. This synthesis summarizes the options available under the Environmental Protection Agency's (EPA) Urban Bus Retrofit/Rebuild Program for heavy-duty diesel bus engines and clarifies the information in the regulations for transit agencies developing their own strategies for compliance. This synthesis also provides an overview of transit agency programs already in place to reduce particulate matter (PM) emissions.


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