(click on image to see the compressed air motor animated)
This is an example of a type of compressed air motor.
This design is similar to the the design used in "Air Hogs" line of compressed air toy planes, cars, motorcycles, submarines, airplanes, helicopters, etc.
This info provided, courtesy of the bibliography of motors
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A compressed air motor is a zero emission motor.
The people at MDI argue that, not only is it a zero emission motor, it actually emits cleaner air than was compressed into it. This happens by the particulate matter in the compressed air settling to the bottom of the tank.
The energy to compress the air can be derived from many environmentally friendly, sustainable sources, such as solar, hydro, geothermal, biomass, etc.