Thank you to Kirk Smith for his reply (below for all Stove Listmembers
to read).
I think someone told me that <2.5 PM cannot be seen. But if there is a
lot of it, is it visibly detectable (like the haze of a smoky room, or
is that just the larger particles that we are seeing?)
Related question: For a small child besides it mother in a smoky
cooking shack, cooking "typically" 2 - 3 times per day, what is the
"equivalent" as expressed in cigarettes smoked per day? And can
that be expressed as equivalent of SECONDARY smoke from being in a room
with smokers in it (but that becomes confused because of room size and
number of smokers in it)?
I am trying to visualize this as a mother/cook smoking cigarettes, and
as a baby or a 2-year old child smoking cigarettes (an unnatural but
powerful visual image).
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 6/4/2013 9:15 AM, Kirk R. Smith wrote:
Quick responses below
At 06:27 AM 6/4/2013, Paul Anderson wrote:
Stovers,
Please tell me or direct me to an explanation of the impact of the PM
that is BETWEEN PM 2.5 and PM 10.
I believe that the experts say that under 2.5 is the bad stuff for
respiratory health, and that over 10 is not sufficiently important
even to be measured.
Yes, material over PM10 generally is caught in the upper respiratory
system (nose, etc) and does not penetrate the body sufficiently to be
a health hazard. May be a nuisance, of course. Major reviews of
health impacts, however, show that the fine fraction (less than 2.5)
is the best single indicator for health, but that the coarse fraction
(between 2.5-10) also shows effects. Thus, no agency has abandoned
PM10 regs, but most are moving to add PM2.5 regs as well. Issue for
measurements right at the combustion source is that nearly all is PM2.5.
Is PM size 10 to 25 (twenty five) ( 50 or 100) "visible"? Detectable
to the nose or eyes?
yes, which is a reason that perception is not a great indicator of hazard
What causes cataracts?
not known for sure, but probably from internal, not external exposure
to combustion-related pollutants in any case. Chemical carried to the
eye through the blood. Eye is well protected externally. Need to
think of PM2.5 as the best indicator of a mixture, not that itself
causes all effects. Like "tar" for cigarettes, which is essentially
PM2.5
How important is the PM larger than 2.5?
See above.
Please forward this inquiry to the stove-medical people who are not
readers of this Listserv.
Paul
--
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
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