EPA – Diesel Emissions Quantifier»
The Deisel Emissions Quantifier is an interactive tool that can help evaluate clean diesel projects by estimating: emission reductions, cost effectiveness, and health benefits.

Urban Bus and Transit Vehicle Emission Calculator»
Calculate emissions for Urban Bus and Transit Fleet Vehicle PM and NOx requirements. These calculators are provided for Transit Agencies' convenience to determine emission reductions.

Department of Energy - Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (GREET) Model»
Evaluate energy and emission impacts of advanced vehicle technologies and new transporation fuels. For a given vehicle and fuel system, GREET separately calculates the following: consumption of total energy, emissions of CO2- equivalent greenhouse gases, and emissions of six criteria pollutants: VOCs, CO, NOx, PM10, PM2.5, and SOx.

Public Transportation – Federal Transit Administration»
Estimate your greenhouse gas emissions reductions from taking public transportation rather than driving.

Fuel Savings»
Calculate fuel usafe and learn how much you could be saving over the lifetime of your vehicle.