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Re: E-M:/ Smog protection



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Enviro-Mich message from "William Tobler" <williamtobler@critterswoods.org>
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I did a Google search on this topic last night, and there are common, 
cheap "dust masks" that filter to 3.7 microns.  So check before you buy 
and try.


> ----------------------------------------------------------------------
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> Enviro-Mich message from "Alexander J. Sagady" <ajs@sagady.com>
> ----------------------------------------------------------------------
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> 
> At 10:08 PM 02/15/2005, you wrote:
> 
> >---------------------------------------------------------------------
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> >Enviro-Mich message from Wes Knollenberg <ecovision@mei.net>
> >---------------------------------------------------------------------
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> >
> >Does anyone know if simple face masks are effective against 
particular 
> >matter and if so, how effective (input PM 2.5 level, output PM2.5 
level)?
> 
> 
> Disposable filter masks that meet the  OSHA N95 standard at 42 CFR 
Part 84
> are supposed to provide 95% control of particles down to 0.3 
microns.   So, 
> the
> answer to your question is that yes...such N95 masks will filter out 
particles
> of 0.3 microns and larger.   There is no guarantee, however, of 
filter 
> efficacy for
> particle sizes less than 0.3 microns....these submicron particles are 
also 
> considered
> as PM 2.5.
> 
> Note that the best designs have two straps and a metal form fitting
> edge around the nose to cut down on air leaks.   Proper fitting is 
necessary
> to ensure that leaks don't undermine the performance.
> 
> Having said all of this, it is also important to know that wearing 
any kind of
> respirator will pose physiological stresses on the wearer that may 
pose risks
> for those with compromised cardiopulmonary health.
> 
> 
> 
> 
> ==========================================
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> 
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