Support for this work was provided by Foundation M, The Energy Foundation, and The William and Flora Hewlett Foundation.This report represents a compilation of hundreds of interviews with school bus transportation directors, state environmental agencies, the U.S. Environmental Protection Agency (EPA), state and local nonprofit organizations, and researchers at the California Air resources Board (CArB).

I would particularly like to acknowledge the contribution of the state directors of pupil transportation, who are not only charged with providing safe and reliable transportation for students, but now also face the added challenge of reducing school bus pollution. These officials willingly provided data on the composition of their fleets and activities to reduce pollution. Our goal in publishing this report is to support their mission by highlighting the need for increased funding for school bus replacements and retrofits.

I would also like to acknowledge the contributions of many state environmental departments and EPA regional offices whose staff willingly shared data they have collected on school bus retrofit and clean-fuel activities. Many dedicated individ-uals are engaged in state activities to reduce school bus pollution, and we applaud their efforts.Several individuals from the EPA and CArB deserve special acknowledgment. At the EPA, Megan Beardsley provided technical assistance on emission factors, and Jennifer Keller and Trish Koman reviewed and commented on our draft report.

At CArB, Ben Hancock, renee Marshall, and Dilip Patel provided helpful assistance on emission factors for particulates from school buses and tractor-trailer trucks. Here at the Union of Concerned Scientists, I am grateful to Jennifer Boynton for her invaluable assistance with data collection, analysis and summaries of in-bus pollution studies, and report editing. I am also indebted to Jason Mark for his technical assistance with data analysis and moral support throughout the process. Thanks also to Eli Hopson and Michelle robinson for their helpful comments, Bryan Wadsworth for his copyediting, and David Gerratt for his design and layout.

The opinions expressed in this report do not necessarily reflect the opinions of the foundations that supported the work or the individuals who reviewed and commented on it. The opinions and information presented are the sole responsibility of the author.

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