Environmentalists here in the U.S. are not happy with President Obama, in part because he pulled back on a promise to tighten ground-level ozone and smog standards for air pollution. But American greens should remember: much of the rest of the world has it far, far, far worse.
Ulan Bator, Mongolia—the second-most polluted city in the world. Credit: Doug Kanter / Bloomberg / Getty Images
Sept. 27, 2011
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