[Stoves] health impact? in Maasai land

[rbtvl at aol.com]

Dear colleagues
 
Our project,   Maasai Stoves and Solar,   www.internationalcollaborative.org
 
introduces stoves that reduce indoor particulates from a 24 hour average of about 2600 micro grams per meter cubed to about 250 micrograms per meter cubed.  and personal exposures of children is about half that.
 
in our communities 25 children per 1000 die from lung disease before the age of 5 according to the head doctor at the Monduli district hospital.
 
and about 5 children live in each house.  So for 200 stoves, we reduce particulates greatly for 1000 children.   If our particulate reduction ended the deep lung infections completely that would mean 200 stoves saves 25 lives, or 8 stoves saved a life.  
 
Of course that is too good an estimate, but maybe 15 stoves saves one life.   If that were true, even though  we are small but have already saved maybe 100 kids.
 
I am trying to get some lung experts to actually come and do a study of our community.  It is a hard study to do with good statistics.   
 
Our carbon monoxide reductions are excellent.   getting the horrible level of 50 parts per million down to about 3 parts per million.
 
bob
 
Robert V. Lange
+1 508 735 9176
 
 
 
 
 
 
-----Original Message-----
From: Marc-Antoine Pare <marcpare0 at gmail.com>
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Sent: Wed, Sep 3, 2014 2:59 am
Subject: [Stoves] health impact?



Hi everyone,


A big confession: having tinkered with stoves for years, I never actually looked into the numbers of stove health impacts. I'm trying to fix that, and I hope you can help!


I mean, yes, I can wave my hands about PM and CO and four million deaths!


But how many deaths (or DALYs) do you avert per stove? Or per 10,000 stoves? Or per 100,000,000?


I thought it would be an easy question to answer, but it's turning out to be quite tricky to even ballpark.


Here is one interesting source. This is from the very recent webinar on Kirk Smith's HAPIT tool. 


http://www.cleancookstoves.org/resources_files/hapit-results-rwanda.pdf



This report considers 25,000 households.
If you provide all of those households a rocket stove, you save only 0.75 lives per year.


If you take the GACC's target 100,000,000 households, that would mean


0.75/25000*100000000 = 3,000 lives saved worldwide annually.



What am I missing there? This seems so small.


Some speculation:


Kirk Smith mentions in the HAPIT webinar that even a small amount of PM2.5 is still harmful. Perhaps biomass stoves just don't get the number low enough?


I think this would fit with the chart in the linked PDF that shows that stoves only reduce deaths by <5% for indoor air pollution. A few times in the HAPIT webinar, they mention "a lot of lives are still left on the table."


This also seems to agree with something I found in Christian L'Orange's dissertation:
http://digitool.library.colostate.edu///exlibris/dtl/d3_1/apache_media/L2V4bGlicmlzL2R0bC9kM18xL2FwYWNoZV9tZWRpYS8yNDYyOTQ=.pdf



Figure 33 shows that Envirofit G3300 stoves only have a 3% (or so) impact on "Adjusted Relative Risk" (of death)




Please do not worry about hurting my feelings in correcting these numbers. Am I thinking about this the wrong way around? Have I punched the numbers in incorrectly? 


Also, I would be very interested to read more good papers on health impacts for stoves. It is all really quite interesting work. I feel bad that I didn't look at it sooner.


Best,



Marc Paré



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