Sierra club names Honolulu as the second cleanest city in the world

The Sierra club lists Honolulu as the second most clean city in the entire world.  The points that really are making the difference for Honolulu, the Sierra club says, is that Honolulu has a light manufacturing industry and that the bus system is so extensive and there are dedicated bus lanes in the city.  They say that this helps with traffic but also the exhaust fumes that would permeate the city if we lacked a bus system.

The cleanest city in the world is Calgary, Canada