FILE - This is a Saturday, Feb. 14, 2009, file photo of Wayne Hall, of Eagle, Alaska, as he leans into a turn on the trail while driving his dog team along the Takhini River after the start of the ... more 
FILE - This is a Saturday, Feb. 14, 2009, file photo of Wayne Hall, of Eagle, Alaska, as he leans into a turn on the trail while driving his dog team along the Takhini River after the start of the 2009 Yukon Quest International Sled Dog Race in Whitehorse, Yukon Canada . Cities in Iran, India, Pakistan and the capital of Mongolia rank among the worst on the planet for air pollution, while those in the U.S. and Canada are among the best, according to the first global survey, released Monday Sept. 26, 2011 by the World Health Organization. Yukon territory's capital Whitehorse was had the least pollution with a yearly average of just 3 micrograms of PM10s per cubic meter, while Santa Fe, New Mexico, measured 6 micrograms. (AP Photo/Fairbanks Daily News-Miner, Eric Engman, File) NO SALES less 
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Associated Press | Photo By Fairbanks Daily News-Miner, Eric Engman, File
Mon, Sep 26, 2011 10:26 AM EDT