Tata and a US based company is developing a green engine that would require only air to run. According the Environmental News Network (ENN), Zero Pollution Motors is developing a vehicle that can motor around all day on nothing but air and a splash of salad oil, alcohol or possibly a pint of gasoline. The car is expecetd to be christened Air Car/ CATS .

The science behind building the Compressed Air Vehicle, or CAV, is not new as off-the-shelf technology already uses compressed air to drive old-fashioned car engine pistons instead of combusting gas or diesel fuel to create a burst of air.