[tobyportugal]

Hello,

I think that several people here received e-mail for a AQI Purpleair.
https://www.purpleair.com/?utm_source=WU...PWS_Owners
[/url]https://www.purpleair.com/map?&zoom=3&lat=45.83957015303712&lng=-14.365157432556154&clustersize=30&orderby=L&latr=79.86901084421095&lngr=236.25000000000006

They use a sensor PMS5003 and Arduino system
https://www.purpleair.com/technology
http://aqicn.org/sensor/

I made a research, and I found a document interesting
http://www.aqmd.gov/docs/default-source/aq-spec/field-evaluations/purple-air-pa-ii---field-evaluation.pdf?sfvrsn=2
[url=http://www.aqmd.gov/docs/default-source/aq-spec/field-evaluations/purple-air-pa-ii---field-evaluation.pdf?sfvrsn=2]
Measurements are rather reliable.
They use THINGSPEAK.COM, the data are easily recoverable.
I would be curious to compare at my Sharp.

If I were certain that Portuguese customs…. Bad recent experiment…   
I would be therefore for a comparative test AQI (PurpleAir/mine/WearherDuino), a good means to refine the AQI WearherDuino.

Good day