Emissions
This page provides a useful resources for estimating the emissions benefits of alternative fuels.
U.S. Environmental Protection Agency's (EPA) Green Vehicle Guide 
This guide helps users choose the cleanest new vehicle model. It rates vehicles on criteria pollutants and greenhouse gas emissions when the vehicle is in use. In 2008, the fuel economy estimates use an updated method that better models real world driving.
Light-Duty Vehicle Emissions
The U.S. Department of Energy evaluates and provides unbiased information about light-duty alternative fuel vehicles (AFVs) in the following evaluations.
Light-Duty AFV Fleet Evaluation
These testing projects are designed to collect and provide objective information on real-world fleet AFV experiences.
Light-Duty AFV Performance Evaluation
These testing projects focus on evaluating specific vehicles or aspects of individual vehicle performance.
Heavy-Duty Vehicle Emissions
NREL compares emissions from alternative fuel and advanced technology trucks and buses with those of their diesel counterparts.
AirCRED Online Tool
Developed for Clean Cities by Argonne National Laboratory (ANL), the AirCRED software package calculates ozone emission reduction credits for AFVs. It is based on EPA's MOBILE model and combined with emission test certification data for new original equipment manufacturer AFVs and their gasoline or diesel counterparts.
The GREET Model
The GREET Model calculates fuel-cycle energy consumption, greenhouse gas emissions, and five criteria pollutants in different transportation fuel/technology combinations. Developed by ANL as a Microsoft Excel spreadsheet, the model allows researchers to evaluate various engine and fuel combinations. GREET is in the public domain and available free of charge.
EPA's SmartWay Transport Partnership's FLEET Performance Model
The SmartWay Transport Partnership's FLEET Performance Model allows companies to quantify the environmental performance of their fleet operations. After inputting the number of trucks in a fleet, gallons of fuel consumed, and mileage accumulated, the model expresses the company's environmental performance for carbon dioxide, oxides of nitrogen, and particulate matter. In addition, the model evaluates the effectiveness of innovative fuel saving and emission-reduction strategies that companies have integrated into their fleet operations.
Related Links
- California Air Resources Board
- DOE/EPA Fuel Economy Guide
- EPA Green Book: Nonattainment Areas for Criteria Pollutants
- EPA National Vehicle and Fuel Emissions Laboratory
- EPA Office of Transportation and Air Quality
- Federal and California Exhaust and Evaporative Emission Standards for Light-Duty Vehicles and Light-Duty Trucks
- Coordinating Research Council