Re: Air quality

["Simon Rafferty" <simonr@xxxxxxx>]

The technologies that I am referring to also drift, hence require weekly
calibration with reference 'pure' gasses, but they will give you an
absolute
reading, ie Ozone is at 45ppm at time X. There is a manufacturer of small
pollution monitors called streetboxes, which are accurate to around 10% (I
think), are solar powered and cost about a grand each (about the size of a
shoebox) and are bluetooth compatible.

Simon
----- Original Message -----
From: "Neil Fuller" <neil@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, May 25, 2004 9:07 PM
Subject: Re: [ukha_d] Air quality


> There are a number of technologies for measuring air quality. The
problem
is
> defining exactly what is meant by the term and exactly what you want
to
> measure.
>
> There are several "Air Quality" sensors available
commercially. They tend
to
> be fairly expensive (Trend Controls AQ/S is GBP128 although Electro
Controls
> EAQ (
>
http://www.electrocontrols.co.uk/htmlcatalogue/airqualityandgassensors.htm
)
> is more reasonable at GBP50)
>
> All of the technologies suffer from drift and their measurements are
> relative - the air is relatively good or bad rather than the air is
23%
> polluted!
>
> Somewhere, I have a BSRIA guide to measuring air quality. It's aimed
at
the
> HVAC industry. The subject was researched with a view to reducing the
fresh
> air requirements in mechanically ventilated buildings with low
occupancy
> density. The industry norm is to supply a minimum 10% fresh air in to
a
> building when an AHU is on 'full' recirculation. As conditioning
outside
> fresh air is fairly expensive under most circumstances, BSRIA were
looking
> at methods of measuring the quality of the extracted air and use that
to
> ensure that there is sufficient fresh air supplied in to the building.
>
> IIRC, the conclusion was that the air quality sensors were not
accurate
> enough and different manufacturers sensors were sensitive to different
> ranges of pollutants and therefore could not be relied upon.
>
> One aspect that they did find was that (unsurprisingly) all the
sensors
> showed peaks in air quality (higher = bad) during the morning and
evening
> rush hour. The closer the building was to a road, the worse the air
quality.
>
> If I can find the document, I'll happily pass it on to anyone
interested.
> It's in PDF mail me at work - nfuller at global-associates dot co dot
uk
> with BSRIA report in the subject if you want a copy or I could upload
it
(if
> I can work out how to do that!!!!!!)
>
> Regards
>
> Neil
> ----- Original Message -----
> From: "Young, Jeff" <Jeff.Young@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Tuesday, May 25, 2004 1:01 PM
> Subject: [ukha_d] Air quality
>
>
> > Anyone know of a way of monitoring levels of polution in the air?
 I
live
> > fairly near a main road and I've been thinking for some time of
monitoring
> > the level of rubbish in the air and possibly providing the
results on a
> web
> > site.
> >
> > Thanks in advanced.  Jeff
> >
> >
>
>
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