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Berkeleys data doesn't have Beijing-specific averages, but their weighted average for all of China of 52 micrograms per cubic meter is roughly in line with Greenpeaces overall averages of 66 (they actually measured slightly different periods of time and used different data collection methodologies).So let's accept Greenpeace's Beijing numbers as gospel

Competing interests The authors declare that they have no financial or personal relationships that may have inappropriately influenced them in writing this article

Thermoelectric coolers have been around for a long time, but newer models, such as the Wagan Personal Thermoelectric Cooler/Warmer, are far more advanced than the clunky units of the past

I knew that these laws were a mistake when we were writing them, says Eric Sterling, who was counsel to the U.S

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