Greyjing's million car experiment

from http://www.boston.com/sports/articles/2007/08/28/close_to_punching_a_ticket/

Pollution solution?

Though the skies of "Greyjing" became a little bluer this month when more than a million cars were taken off the road during a four-day experiment, the capital city's air pollution still is a concern for next year's Summer Olympics. International Olympic Committee president Jacques Rogge has said that certain endurance events, like the marathon and cycling road races, could be postponed until conditions improve. Holding the Games in August, with its oppressive heat and humidity that keep things hazy, doesn't help