[aedocw]

For folks who want to do something similar (no CO2 measure, and possibly less accurate) for far less per sensor, you can easily connect an ESP8266 ($5) to an IKEA VINDRIKTNING ($16) air quality sensor[1]. Stick a AM2302 ($7) on the outside and you get PM2.5, temperature and humidity for about $30.

[1]: https://style.oversubstance.net/2021/08/diy-use-an-ikea-vind...

[M3L0NM4N]

I will note though, CO2 measure indoors can be very valuable. Higher levels of CO2 result in less brain function, as shown by this Tom Scott video: https://youtu.be/1Nh_vxpycEA

[reeckoh]

They can also be a canary for other issues, like mold accumulation.

[PaulBGD_]

I have both a modded VINDRIKTNING and the airgradient, imo the airgradient is worth it if you want everything in one package. More accurate than the ikea, a nice screen/case, and you don’t have to strap a humidity sensor to the outside. Plus CO2 is great, more people need CO2 detectors.

[jve]

Did just that by following that particular tutorial. Didn't expect accuracy, just following how air quality changes when baking, turning on humidifier, etc.

However now my VINDRIKTNING shows red with MAX reading all the time - I suppose not to be placed in the kitchen - some sticky oil grease landed on the sensor.