posted on May, 2 2009 @ 12:31 PM
If I may suggest, one may wish to consider the 3M 6800 series of full face respirators with P100 HEPA/Organic gas filters.
The HEPA filters will filter out 99.97% of all particulates down to .3 microns, and since you can get all sorts of variations with the filters in
addition to being P100 HEPA filtration, I found the Organic vapors addition to be nice.
Strong chlorine or even Ozone concentrations do not easily pass through these filters.
Unless you are breathing in some really dusty, nasty conditions, the filters will last for months, and the mask itself will last for years.
They come in different sizes, and you want to make sure you get a good seal.