Drivers drive electric cars powered by alcohol and natural gas during the Clean Air Car Race in Pasadena,California.

Clean Air Car Race in Pasadena,California. Truck,spewing diesel fumes, a bus, and more trucks, seen on highways and streets. 'Stevens Institute of Technology Electric Vehicle,Powered by Alcohol,Powered by Clean Burning Natural Gas,San Diego State College,Diesel powered by Wilcap' written on side of cars depicting the alternative fuel used. Mechanics check the engine of a car. Drivers at electric car charge station. The clean air car race begins. Cars move one by one. They drive through streets. Driver opens the car bonnet and repairs the engine. Man rides a motorbike. Animated map shows the route of the race. Sign board on the street reads Pasadena. Spectators gathered at the finish line.