Though it seems unbelievable; Scientists have made such a car known as "AIRPod"...
An AIRPod is a prototype of an alternative fuel vehicle produced by Motor Development International(MDI) that is powered by compressed air.
Since this car uses pure air, so only pure air gets emitted from the car. As a result , it doesn't pollute our environment.
It is designed as an zero-emission urban vehicle. Prototypes have been tested by KLM/AirFrance for use as emission-free vehicles in airports.
The AIRPod comes in three models that vary the number of seats and amount of cargo storage while keeping the same basic chassis. AIRpod has 3-4 seats and Joystick as steering control. It's chassis is made of glass fiber / polyurethane foam. LCD screen is used as Rear view. It is having 2.07m, 1.60m and 1.74 m as length, width and height respectively.
AIRPod will come to market on 2014.