I personally use an Atomotube Pro (https://store.atmotube.com/) which also has the added benefit of being portable.
I'd say they do a great job.
While they offer hub and app (not sure if the app is cloud connected) for less technical users, most of the 'smart' product line is just zigbee so will work with any zigbee gateway. I think that should be applauded, especially as other "smart" product providers either go bust or pull product lines rendering them useless.
Edit: I guess people are extrapolating that info on being compatible with their DIRIGERA Hub, that seems to be Matter compatible.
9to5mac reports this info:
Update 2/15: IKEA has shared with us that the DIRIGERA smart hub doesn’t have Matter support yet (after its launch last fall), but it is “ready” to enable it with a future update. As noted below, the new air quality monitor does not have HomeKit or Matter capability on its own but can gain it when paired with the DIRIGERA but only after IKEA pushes the Matter update to the hub. We’ve reached out to IKEA asking about a Matter launch date.
One thing that it lacks is WiFi connectivity - all syncing needs to be done via bluetooth. Which makes sense since it's portable but WiFi would be nice when it's at home. But the device is open and their site gives you ways to make it WiFi compatible if you so desired.
I originally found it through a report that showed it as effective as expensive air quality testing gear. It happened to be the only portable one as well that rated that well.