[Stoves] personal pollution monitors (Andrew)

Crispin Pemberton-Pigott crispinpigott at outlook.com
Fri Dec 23 17:16:52 CST 2016


"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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