This is the best tldr I could make , g i a n t s m o g s u c k i n g t o w e r w a s s i m p l y nomatchforitsairpollution reduced by 77 %. I ' m a bot The Smog Free Tower would , it was said , purify 30 , 000 cubic meters of air every hour , collecting over 75 % of PM 2 . 5 and PM 10 , the small particles that contribute to smog . The PM 2 . 5 concentration was 89 micrograms per cubic meter within five meters of the tower , and reached 109 micrograms within 100 meters . The tower # 039 s developers , Dutch studio Roosegaarde , claimed on Nov . 23 that the tower had cleaned an air volume equivalent to that of quotTen Beijing National Stadiumsquot in its 41 day test . Extended Summary Version 1 . 65 , ~ 24987 tldrs so far . % 23 autotldr PM ' s and comments are monitored , constructive feedback is welcome . Top keywords Tower # 1 meter # 2 PM 2 . 5 # 3 Smog # 4 air # 5