if you are concerned about whats in the air and actually want to do
something, you need a respirator with cartridges rated for what will be in
the air, that will absorb it and not just shoot it back out when you exhale.

randy


Good point Randy. Respirators are becoming common enough that the BORGs have
them along with an assortment of different filters.
It is really cheap insurance since the filters are fairly cheap and a good mask
will last a long time.