The Air Car

From time to time, I note technological developments that will have an impact on the environment and, more particularly, the soundscape

I have been hearing about "The Air Car", a car that runs on compressedair. (I guess you could say it runs on electricity, since that is what powers pneumatic pumps). It may or may not be true that this car is far enough along in development that it is going to be mass-produced in India.

I imagine that if it works, it would eliminate a great deal of smog in the cities around the world. It would shift Green House gas emissions to the electric grid, but there are several reasons why this would be much easier to contain.

So, what quietnorth wanted to know: How will this impact the soundscape? According to one web site, since there is no internal combustion, the sound created is much less than conventional engines, though not as little as an electric car.