So sad. You trust the air in public places. Poor thing.
At home I think I am totally safe - right, if your windows are always open and no heating is used?
are always open and no heating is used?
What I have is a high quality detector that measures trace elements in addition to being an alarm. These devices are recommended to be replaced every 5(?) or so and rather than throw them out, I just buy a new one but put new batteries in and keep the old ones as well .....and put it in a different part of the house. I'm up to 5 of them and even if they don't work as well as new, I always have my latest one that should be working properly.
I think the important thing is not to be the most susceptible. Let someone else be the canary in that coal mine. I just replaced my CO detectors (they were five years old). CO is one of those things I do worry about, and about which I can do something.
There was a guy on the internet that used to sell ampules of CO that you would break open and put in a plastic bad with your CO detector to test it. I can't find them anymore, now I have to depend on the age of the device.