The purpose of this paper is to identify and assess risks related to alternative fuels, and relate those risks to public health and life cycle questions. Using the school bus fleet of the Chicago Public Schools as a model, this paper compares the environmental health and safety impact of current diesel fuel usage with that of increased use of alternative technologies and fuels.

Four alternative fuels have been studied: Low sulfur diesel (baseline), biodiesel (BD20), ethanol-diesel blends (ED10), and compressed natural gas (CNG) from renewable feedstocks. Impact was assessed utilizing the GREET (Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation) 1.7 Well to Wheel model.

You can access this article if you purchase or spend a download.