
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.
That’s one takeaway from a new report by the World Health Organization that looked at urban air pollution around the world. The most polluted cities tend to be found in developing countries.
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