[Stoves] new health study

[Norbert Senf]

>
> Date: Mon, 24 Sep 2018 16:53:53 +0000
> From: "Law, Steven (MECP)" <Steven.Law at ontario.ca>
>
> But is it burning wood that is the problem or is it the lack of venting
> the smoke fumes away from the people doing the cooking that is the problem?
> I would offer that with proper ventilation of smoke fumes away from the
> people doing the cooking these problems would either go away or at least be
> diminished greatly.
> Somehow we figured this out centuries ago...how have these folks not
> figured this out?
>

Hi Steven:

That is a good question, seemingly obvious.

Here's the results summary section from the paper:

---------------------
Measurements and main results:
Overall 91% of participants reported regular
cooking, with 52% using solid fuels. Compared with clean fuels users, solid
fuel users
had adjusted HR of 1.36 (95%CI 1.32-1.40) for major respiratory diseases,
whereas
those who switched from solid to clean fuels had weaker HR (1.14,
1.10-1.17). The
HRs were higher in wood (1.37, 1.33-1.41) than coal users (1.22, 1.15-1.29)
and in
those with prolonged use (≥40 years: 1.54, 1.48-1.60; <20 years: 1.32,
1.26-1.39),
but lower among those who used ventilated than non-ventilated cookstoves
(1.22,
1.19-1.25 versus 1.29, 1.24-1.35). For CLRD, COPD and ALRI, the HRs
associated
with solid fuel use were 1.47 (1.41-1.52), 1.10 (1.03-1.18) and 1.16
(1.09-1.23),
respectively.
----------------------

The effect from non-vented stoves was larger, but not by a lot, which is
surprising.

Crispin has some experience in China, and would be more familiar what some
of the
typical cooking scenarios are vis-a-vis vented/non-vented, and outdoor
ambient air quality.

I've worked in Guatemala with my friend Pat Manley's project, building
vented cookstoves
that replace 3 stone fires which are often in the house, and sometimes in a
separate fairly
drafty kitchen. Here, the venting is definitely a huge improvement since it
is rural and outdoor
air quality is very good. Indoor air quality can be to the point where
you'd have
stinging eyes and a hard time breathing. The health effects on women and
children are
quite obvious, and there is not doubt whatsoever that the (wood)smoke is
the cause.  ............N

-- 
Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
819.647.5092
www.heatkit.com
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