In 2013, Beijing ranked as the 40th worst city for the particulate PM2.5, but four years on it’s in spot 187. In the 62 Chinese cities for which the WHO has data in both 2013 and 2016, pollution levels dropped by an average of 30%.

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from World News https://www.reddit.com/r/worldnews/comments/8gmcde/in_2013_beijing_ranked_as_the_40th_worst_city_for/