Adafruit sells a lot of air quality sensors that can work with RasPi, Arduino, etc. They also have lots of guides. So I'd just go on there and take a look. My setup isn't really unique. I used this link: https://www.balena.io/blog/build-an-environment-and-air-qual... as my guide for setting up something with logging and graphing. I didn't do a full Docker-fied Balena cloud deal; I just replicated the stack manually and used their guide as inspiration. It's overkill, but was quick and works fine.