There are racist Clinton supporters as well . But for some reason you aren ' t advocating people protest her . <| sep |> It does not separate airin from airout . So it ' s largely reprocessing the same air . It ' s just a small filter . Your home furnace ' s filter probably catches more . It wouldn ' t be significant if there were a million of these in the city , and the bottom line is the core concept is not costeffective . e . g . if you had a $ 1 B grant , by all means , replace all the twostroke scooters with cars , institute emissions inspections and enforce it , close or upgrade a couple of factories , and you ' ll get 1 , 000 , 000 x more pollution reduction than buying $ 1 B of wholecity air filters . <| sep |> if you guys come to Chicago I know a guy that will be very happy me