Hacker News new | ask | show | jobs
by rickyc091 1951 days ago
It's not a necessity if you have the window open to move around the air, but that's typically not as much of an option in the winter. You'd be surprised how much dust and particles a purifier picks up.

If you take a look at the photos for the Blue Air 211 on Amazon, you can see how much it picks up. Mine was exactly like the photos. The pre-filter was completely covered in dust, and the inner filter was completely dark after 6 months of use.
1 comments
JohnBooty 1951 days ago 

    It's not a necessity if you have the window open to move around the air,
If you live in an urban area or someplace else with lots of air pollution, the outdoor air might be a problem!

Of course, I don't think an air filter like this would be very effective with the windows open.

link