Shameless plug.
If you prefer an open source / open hardware air quality monitor check out our popular DIY air quality monitor [1]. The built uses high quality sensors for PM, CO2, Temperature and Humidity. You can either build it yourself or get a kit from us with a nice plastic enclosure.
You can also get the SGP41 as an optional module which not only measures TVOCs but also NOx and we can see it reacts to gas ovens/boilers.
Since it is open source, you can either send data to our dashboard or to your own server / home assistant etc. So it does not force you into a subscription or a specific dashboard.