In an effort to clean up some of the dirtiest air in a major urban area, Mexico City has reportedly committed to a fleet of 40,000 taxis that run on air — compressed air stored in four onboard 3-cu.-ft. (84L) tanks at 4,500 psi (310 bar). The 4-passenger (plus driver), 1,540-lb. (699-kg) vehicle is made of fiberglass and honeycomb plastic and has a claimed range per “fill” of 120 miles (193 km) and top speed of 60 mph (97 km/h). The air tanks can be refilled in four hours with a 5-kW ...

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