Because CO kills surprisingly quickly -- unless your commute is in the order of a couple of minutes you&#x27;d be too late.  Also you don&#x27;t send a person into a house with a CO leak so asking you neighbour to retrieve your cat would be placing them in danger.<p>My point is that the smoke alarm and the CO alarm should be exactly what they are simple alarms that allow occupants to escape in an emergency.  Adding IOT capabilities doesn&#x27;t add to the alarm functionality in sensible ways.  However, it does risk introducing vulnerabilities.  I don&#x27;t want my smoke alarm to start sending spam emails (this really happened with a smart fridge a couple of years ago).