Dust comes in from the upper atmosphere. Agricultural activity
generates a lot of dust. Here in Minnesota we joke that it all comes
in from the North Dakota wheat fields. Just imagine how much dust is
created when they plow those fields!

You do not want to buy one of the ozone generators or de-ionizers. I
have owned the Honeywell stand-alone filter for years and they work
great. I have one next to my bed. It includes both a charcoal
pre-filter and a HEPA filter and scrubs the air to a microscopic level.


The ones that really work have a fan that actually blows filtered air
around. If it doesn't have a fan, then it doesn't really work. The
only drawback is the noise. To reduce noise buy a larger unit and
then run it on low. I don't know anything about the whole house
filters but it seems like they would work while the fan is running.

Lawrence