Probably not at the level that OP is asking about, but the IKEA Starkvind air purifier, aside from being a good-looking, cheap and effective home purifier, is a Zigbee device that exposes the raw PM2.5 sensor reading.
One Starkvind (or more if space and budget allow) and few temperature/humidity sensors (I have a few $10 ones from Sonoff), combined with a Raspberry or an HTPC running Home Assistant and any Zigbee gateway, can give you a better idea about what the air is like in your apartment than most people have.
I'm still looking for a non-DIY CO2 sensor solution I could add to my Zigbee based network, most of the stuff I've found is either totally DIY or industrial.
The Aranet4 device is a non-DIY CO2 sensor however it operates over Bluetooth instead of Zigbee, not sure how much of a deal breaker that is for you. I had no trouble hooking it up to my Home Assistant setup though, and the device is fairly affordable (for a "proper" CO2 sensor that is, not one of those Ali Express devices that estimates CO2 by VOC measurements).
One Starkvind (or more if space and budget allow) and few temperature/humidity sensors (I have a few $10 ones from Sonoff), combined with a Raspberry or an HTPC running Home Assistant and any Zigbee gateway, can give you a better idea about what the air is like in your apartment than most people have.
I'm still looking for a non-DIY CO2 sensor solution I could add to my Zigbee based network, most of the stuff I've found is either totally DIY or industrial.