U.S. Embassy air quality data undercut China's own assessments

One day this month, the reading was so high compared with U.S. standards it was listed as 'beyond index.' But China's own assessment that day was that Beijing's air was merely 'slightly polluted.'Perched atop the U.S. Embassy in Beijing is a device about the size of a microwave oven that spits out hourly rebukes to the Chinese government.

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