11/21/16 Called today for a ride to the airport and was advised that Clean Air Cab is no more. They have been purchased by Apache Cabs.
My ride to the airport fell through at the last minute (their car broke down) and my frantic phone call to Clean Air Cab resulted in a friendly driver showing up at my door in just 15 minutes. The cost was about $10 less than SuperShuttle usually wants for the same ride. The car was clean and smelled OK. The ride went smoothly. The only negative I could see is if you have a large family or lots of luggage, these are relatively small sedans.