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Beijing is choking in its worst smog so far this year, with the reading at the US embassy hitting as high as 545. An air quality index (AQI) reading of more than 200 is "very unhealthy". The United States embassy measures PM2.5 particulates as an indication of the air quality at its compound in Chaoyang district. The average AQI reading released by the Beijing Environmental Protection Bureau was slightly lower at 430. Residents were advised to don face masks and avoid outdoor activities. [Source: South China Morning Post]
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