Qiaochu_Yuan comments on Open Thread for February 18-24 2014 - Less Wrong
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How do I verify whether the air quality in a room is bad? I'm concerned that being in a particular room is causing me to sneeze.
Well, normally you sneeze (too much) either because the room is too dusty, or because you have a mild allergy to something in that room.
Does the room look dusty? If you don't wipe a horizontal surface, how much dust would accumulate in, say, a week?
The allergy thing is more complicated, but one way to test it would be to take some OTC anti-hystamine and see if that stops your sneezing. If it does you should update towards being allergic to something in that room.
The room is somewhat dusty. Dust accumulates visibly on my desk after something like 4 days, I think.
You can put an air filter in the room for a while and see if there's a noticeable change. If you want to be scientific about it you can ask a friend to turn it on and off at random while you're out of the room
Bad is hard to quantify.
What particular aspect of bad air quality makes you sneeze? Once we narrow that down we can review options.