from Hacker News

DIY air filter for polluted cities

by arnie001 on 12/28/15, 5:43 PM with 4 comments

• by hgbrian on 12/29/15, 4:52 PM

  Smart air filters has a similar idea: http://smartairfilters.com/en

  Both projects use a Dylos particle counter, which is a great tool.

• by olva22 on 12/28/15, 6:55 PM

  I built a very similar thing in the US. I don't know where these fans or hepa filters are sold, but I buy a standard 20" boxfan at walmart ($16ish USD), and a 3M Filtrete AC filter in 20x20x1" size (also ~$15USD). These come in different ratings, so I buy the "allergen reducer" rating or higher.

  Duct tape to the back of the box fan, done.

• by mariusz79 on 12/29/15, 4:50 PM

  I would add activated carbon filter to remove even more stuff