- Clean Cites Web Site - Clean Cities Hotline - 1.800.ccities (1.800.224.8437); e-mail: ccities@nrel.gov
- Alternative & Advanced Vehicles - Vehicle Make/Model Search
- Alternative Fuels Data Center - (a one-stop shop for all your alternative fuel and vehicle information needs)
- Alternative Fuels Information Resources
- Bioenergy Information Network
- Energy Efficiency Renewable Energy (EERE)
- Idling reduction information for school buses
- National Biodiesel Board
- United States Council for Automotive Research (USCAR)
- US Department of Energy