World is looking towards alternate energy sources for powering our vehicles. Vehicle running just by clean air is a new discovery. Lets understand the technology first.

These compressed air cars get their power from engines fueled by the decompressing air. It extracts the energy of fast moving air as it surges through the system.

The air is stored in a tank at high pressure. And manufacturers make the tank out of carbon fiber to reduce its weight.
In compressed air cars, the expansion of compressed air drives the pistons.

These type vehicles are emisssion free at tail pipe. But how environmental friendly it is, depends on the how cleaner electricity we use in compressing the air.