Smog Free Tower has been deployed for testing around Rotterdam. While it may not be a complete solution to urban air pollution, it can at least carve out breathable areas in key civic spaces like downtown squares and public parks.
20-foot tower cleans 30,000 cubic meters of air per hour, running on about the same amount of electricity used by a water boiler (1,400 watts). Low-energy technology efficiently powers both the ionization process and on-board LEDs that light the structures up at night.
http://weburbanist.com/2016/01/28/smog-sucking-tower-cleans-30000-cubic-meters-of-air-per-hour/
Nice, but these seems to be much better solution:
https://www.newscientist.com/article/dn4636-smog-busting-paint-soaks-up-noxious-gases/
http://content.time.com/time/specials/packages/article/0,28804,1852747_1854195_1854176,00.html

20-foot tower cleans 30,000 cubic meters of air per hour, running on about the same amount of electricity used by a water boiler (1,400 watts). Low-energy technology efficiently powers both the ionization process and on-board LEDs that light the structures up at night.
http://weburbanist.com/2016/01/28/smog-sucking-tower-cleans-30000-cubic-meters-of-air-per-hour/
Nice, but these seems to be much better solution:
https://www.newscientist.com/article/dn4636-smog-busting-paint-soaks-up-noxious-gases/
http://content.time.com/time/specials/packages/article/0,28804,1852747_1854195_1854176,00.html