CleanAir Cabs is a new program designed to replace ordinary taxis with cleaner vehicle technology.
CBS4 Boston - Sep 22, 2006

A Toyota Camry hybrid owned by Boston Cab Association, took to the streets on Friday.
"This is yet another example of how we can partner with an important industry serving Boston's residents and visitors to reduce impacts on public health and the environment," said Mayor Menino in a statement. "We are constantly examining ways to reduce the effect of vehicle emissions have on our air quality, and the associated health impacts for Boston's children and elderly people."
Boston CleanAir Cabs is a new program designed to replace ordinary taxis with cleaner vehicle technology. All clean air cabs will have a green stripe on the vehicle, indicating the taxi is cleaner for the environment.
The city has committed to allow three pre-approved vehicle models to be used as taxis for the program: the hybrid Toyota Camry, the hybrid Ford Escape and the CNG Ford Crown Victoria.
MassPort is also a partner on this project. The agency may soon offer incentives such as reduced airport access fees as a way to get more hybrid taxis on the streets.