West's air, from pristine to poor
Updated: 2011-12-25 08:04
By Kirk Johnson(The New York Times)
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Climate models suggest a dustier future for the American West. A dust storm that covered Phoenix, Arizona, in July attested to air quality concerns. Rob Schumacher / The Arizona Republic, Via Associated Press |
The New York Times
(China Daily 12/25/2011 page10)