Clean Air Cab, a Phoenix-based taxi company, has become the second taxi cab fleet in the nation to rely solely on hybrid cars.
The first was EnviroCAB, in Washington, D.C., using a fleet of hybrid Toyota Priuses, Camrys and Highlanders and Ford Escapes.
Clean Air Cab is offering slightly lower rates than other area cab companies, according to a press release.
The company says that the Ford Crown Victorias used by most cab companies release 160 percent more emissions than its Priuses.
In addition to using hybrid vehicles, Clean Air Cab purchases carbon offsets to negate its emissions, calling itself carbon neutral.
As of now the company has 26 cabs, with plans to eventually grow to a fleet of more than 200.