Do you know of any low-level carbon monoxide (CO) detector in the north-american market that is compatible with Home Assistant?
Of course, I’m not talking about those smoke/CO alarms that are just binary sensors triggered when the CO level reaches 50ppm or more. I would want something that monitors the CO level below 50ppm. a precision of about 10ppm seems to be the norm for low-level detectors on the public market, which is fine.
Most of what can be found online are non-smart devices. There is the Fibaro CO detector that can be either Z-wave or HomeKit compatible, but it is hardly available in the US.