[Stoves] personal pollution monitors (Andrew)

IPC ipcipc at mweb.co.za
Sat Dec 24 04:07:47 CST 2016


At the Chamber of Mines we did an enormous amount of work on silica inhalation. In brief our findings were that the material of most concern was the 1.6-0.5 micron fraction, because that had significant retention in the deep-lung tissue. The fraction in air was strongly dependent on humidity and somewhat dependent on pressure (some mines were 2500m below sea level). The fraction also fell with time after blast, but this process was quite slow.
Philip

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin Pemberton-Pigott
Sent: Saturday, December 24, 2016 1:17 AM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] personal pollution monitors (Andrew)

"I do wonder why we have gravitated to PM2.5 when 15 years ago only pm10 seemed to be mentioned.‎"

PM 10 looks bad but isn't very harmful, on average (equitoxicity).

PM2.5 is a 'blank zone'. There is almost none around. A small measurement error such as a separator running slightly 'off' gives the same result as one 'on'. It was chosen deliberately because there isn't much to be wrong about. 

PM10 was early days stuff. There is a lot right on that size. If the sampler is a little off, there is a lot to be wrong about so calibrating and replicating are a bit challenging (to say the least).

Even a small difference in a separator's function ‎created a significant difference in the result. 

'Breathable' in terms of inhalation starts at PM 4, not 2.5. However nearly all wood and coal and LPG and ethanol smoke is under PM1.6. The particles are very different in terms of their toxicity. Nikhil is making that point. 

Regards
Crispin
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