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Looking for an indoor air quality monitor to buy, any recommendations?

To monitor what (e.g. what particular size, VOX, radon, etc)? And do you need logging? Because that almost entirely determines which one.

For simple, cheap, PM2.5 and above, the Ikea "VINDRIKTNING" is a good choice. It only offers a simple traffic-light system though, no logging and numeric readout. USB-C powered (cable and power-brick sold separately). Around $25~ including buying the USB-C cable and power-brick, $13 alone.

Mainly to know when to open windows (CO2 monitor?) and to vacuum and its effect (PM2.5?) and maybe some generic stuff because why not (temperature, humidity, pressure). I probably want something more precise, that just a traffic light system, but don't plan to plot readings in Grafana either.

CO2 can be a little expensive, AirThings sell one but $200(!).

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