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Re: E-M:/ Smog protection



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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.




========================================== Alex J. Sagady & Associates http://www.sagady.com

Environmental Enforcement, Permit/Technical Review, Public Policy,
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Waste/Community Environmental and Resource Protection
Prospectus at:  http://www.sagady.com/sagady.pdf

PO Box 39,  East Lansing, MI  48826-0039
(517) 332-6971; (517) 332-8987 (fax); ajs@sagady.com
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