Gradko DC1100 (I think this is the same unit as Dylos DC1100, but under a different name [in U.K.])
http://www.envirotech-online.com/news/h ... itor/2957/
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These folks are woodworkers concerned for their health. They are considering a "group-buy-discount,"
which is not a bad idea for us to consider doing here also. Read on:
Dylos Air Quality Monitor Group Buy (Canadian Woodworking Forum)
http://forum.canadianwoodworking.com/sh ... 70&t=25360
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Here are some readings I've been taking over the last few months. All have been made in conditions of
<80% relative humidity. (In saturated air, there is an abundance of water vapor nanoparticles, making
readings too high.) Low humidity contains far fewer vapor particles. The readings were taken at the
same location, when noticeable odor was present. (Not corrected for baseline.) Wind disperses particles
much better than stagnant air can, as suggested by the much-higher "calm" readings. These readings
are a running average of several dozen individual observations.
A reading of 3000 on the instrument is considered very poor air quality (orange zone.) "3000" means
3000 particles per one-hundredth of a cubic foot, or 300,000 particles per cubic foot, or 10.6 million
particles per cubic meter.
Typical neighborhood wood smoke readings taken on the DC1100 particle counter:
fine(0.5µm) coarse(2.5µm)
windy day 600 50
calm day 2000-9000 100-700