On Fri, 16 May 2003 13:32:18 +0000 (UTC), (Victor M.
Martinez) wrote:

animaux wrote:
Not a bubble, but the house is HEPA filtrated.

Unless you have a positive pressure gradient and a two-door entryway, your
HEPA filter is pretty much useless. You see, most houses (mine certainly
isn't) are not even close to being airtight. Outside air flows inside freely
(you really think all the dust you vaccuum weekly is produced *inside* the
house?) and it brings pollutants in. There was a study done a few years back
that measured pollutants inside and outside houses. In some cases the
pollutant concentration was actually higher indoors, since there is no wind
to disperse them inside.

While I agree with your assessment, our home is relatively clear of excess
pollen, and other particulates. Our whole house vacuum is HEPA filtered.

We have significantly less pollutants in our home than are outside. When there
was construction the air was much harder to keep filtered. Nothing is 100%, but
you certainly can improve indoor air quality if you take proper measures.