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Tony (Chinese name withheld), a 32-year old office worker rides a bus home during his lunch break in central Beijing. "From 2013, I started using the mask. At that time the media reported the air was very serious. It was the first time it was said to be smog", he explains. He uses online apps to monitor the air pollution levels each day. "If the index is over 200, I use it. Over 400? You must use it! I've asked my family and friends to wear the mask, especially when it's over 200". PM2.5 reading - 212 - Very Unhealthy


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