As far as the pollution created/energy consumed by the air compressors needed to "fuel" the car... it's the same argument that applies to electric cars: If you own an "electric station" that sells electrical charges for electric cars, you use X amount of energy to create the electricity used to charge the electric cars... but the cars themselves (assuming they are pure electrics, not hybrids) cause zero pollution.
If you own a gas station, that gas in your underground tanks also used X amount of energy/caused X amount of pollution to get to your tanks, but every single car that fills up also causes it's own amount of pollution on top of that.
If you plug in numbers, it's pretty obvious that if we all drove electrics (or air-powered cars) there would be less pollution/less energy consumed overall.
The days of our cars being powered by gasoline burning internal combustion engine are definitely numbered, IMO. Not sure what will replace them, but they are going to be replaced. Maybe not in our lifetimes, but I'd guess certainly before this century is over.