Originally Posted by BeatNavy

There's an O2 mask right next to bus pilots (although it can apparently enter the body through the skin).

Also there are blood tests I'd recommend getting annually, so you have proof of your levels if you get hit with a fume event. Levels vary in each individual, and if you ever go out on medical because of fumes, it'd be very difficult to directly link fumes with the ailments it causes (headaches, memory loss, cardiac issues, neurologic issues, etc., as those things can happen with age as well) without having baseline levels on file. If you have baselines numbers, then have highly elevated levels with subsequent issues after a fume event, it's a lot more definitive.

Here's a post from bluepilots about the tests:



The last 2 are the tests that detect TCP exposure.


To answer your question though, some people do stay on the 190 to avoid fumes. But the pay, schedules, workload, etc., is worth it for some despite the risk if the O2 mask can partially mitigate it when needed.