4 ms·
The article is about PM2.5 consumer units, and I can well believe that price doesn't make much difference. However, I'd like to point out CO_2 - there are two
by mnw21cam 3y ago
The article is about PM2.5 consumer units, and I can well believe that price doesn't make much difference.
However, I'd like to point out CO_2 - there are two kinds of sensor. One of them measures volatile organic compounds and assumes that CO_2 correlates with them, and the other actually measures CO_2. The second type costs around £40 for the raw sensor - if your sensor is cheaper than that then it probably isn't actually measuring CO_2.
- ImaCake 3y agoIf it's measuring VOCs and you live in a city then chances are it would be measuring car exhaust!
- michaelcampbell 3y agoIs that bad? I mean, VOC's are VOC's regardless of source, no?
- ImaCake 3y agoDepends if you care about CO2 and presumably the CO2 from breathing humans. The VOCs from cars in a busy city will mask/overwhelm/confound any measure of human body produced CO2 in that location. But a more suburban or rural location will be fine.