I'm not sure, Erez. Most of what I deal with is odors, usually deisel fume or body odors. It is possible that tear gas and VOC's are bigger, a particle rather than a molecule, in which case HEPA or ULPA filtration would be more appropriate. When I get time I'll look into it.

: hello Don,

: very interesting info !

: thank you.

: I once had a chance to test a gas mask in a tent full of tear gas.

: I entered the tent with the mask on & I didn't feel any (!) tear gas
: at all. infact I couldn't believe there is tear gas all around me.
: I walked in there for 2 minutes or so & I tried to breath heavily
: so I could feel just a little tear gas, but I couldn't feel any gas
: at all (!)

: & then I took the mask off & BANG ! there was more tear gas in there
: than air.

: it feels like your head is exploding, but after few minutes it's all
: gone.

: I know the filter on the mask is carbon.

: air comes in thru the filter & goes out thru an exhaust unidirectional
: valve.

: I'm not sure what tear gas is made of.

: how does my testimony fits your info ?

: thx

: Erez