Weather Station Hardware > Air Quality Sensors

Davis AirLink vs. PurpleAir Accuracy

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Snowda:
For those interested, SC-AQMD has done some evaluations of various devices: http://www.aqmd.gov/aq-spec/evaluations/summary-pm

As has METAS: https://www.metas.ch/metas/en/home.html

We've found the IQAir AVP & AV Outdoor to be the better options for us based on cost, accuracy, reliability and data availability.

Davis lacks a CO2 sensor which was a key drawback so we didn't look at it much further. As mentioned above, we saw other reports of humidity problems with them which raised concerns. IIRC they use a single reflective sensor rather than separate emitter+sensor for PM which might be an issue. I THINK the better devices use separate emitter+sensor (and often dual) and have airflow that cleans both of them to prevent/reduce stuff sticking to them.

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