China Builds Worlds Biggest Air Purifier Posted by ccoggins on Tuesday January 16, 2018 @01:11AM from the scmp.com dept. http://www.scmp.com/news/china/society/article/2128355/china-builds-worlds-biggest-air-purifier-and-it-seems-be-working ( 1 comment | 3 points | on HN )
https://en.wikipedia.org/wiki/Solar_chimney