[danans]

> Anyone have any air quality sensor recommendations?

Search the HN archive. There are lots of debates and discussions about air quality sensors, especially around the time of the West Coast US fires.

But from right now, every time you turn on your gas stove or oven, open a window and set your stove extractor fan to maximum, even if it briefly makes your house cold.

[scottlamb]

I don't recall any NO2 sensor recommendations in particular, and that wouldn't have been a focus during the fires. In general though folks here discussed AirGradient kits. https://www.airgradient.com/open-airgradient/kits/ I bought a stack of them, and I recommend them. The Pro kit at least has extra I2C module spots on the board (one for 3V3 modules, one for 5V modules). They sell a SGP41 module for VOC, and (I didn't know this until I looked at the spec sheet [1] just now) it also supports NO2. The output's apparently an "index" rather than calibrated physical units that you could compare to the threshold/graph in the post though.

(btw: iiuc the "special" thing about the SGP41 module sold by AirGradient as opposed to some Alibaba vendor is that the AirGradient one doesn't come with surface-mounted terminating resistors installed. If you buy one from somewhere else and want to plug it into the AirGradient board, you need to desolder those because the AirGradient's I2C bus is already terminated elsewhere.)

I have an older SGP30. Less luck there; it does VOC and CO2, no NO2.

[1] https://sensirion.com/media/documents/5FE8673C/61E96F50/Sens...

[virtual_void]

Thanks. Will take your advice on both counts!