I've been on some where you can smell the jet fuel (kerosene) when they start the engine because they forgot to close off the cabin. They said it was normal and "harmless". It was probably harmless for me, considering the infrequent flights I take, but not to cabin crew.
Also, like astronauts, flight crew receive significant cumulative ionizing radiation exposure.
Even then, obviously it won't help with carbon monoxide. Only the oxygen mask could. I would stick to Boeing planes for now to lower the risk since it's greater in Airbus planes.
Note that a standard pulse oximeter could continue to falsely show good oxygenation when having carbon monoxide poisoning, so do not trust it then if it shows a high value.
Note that some these meters can alarm, and sometimes alarms can be false, so if you don't want one that alarms, then find that one.
Note that there is nothing much that one can do while in flight except take pictures, videos, complain loudly, change seats from back to front, threaten to sue, maybe use the oxygen mask if lucky, and take down information of other passengers, all before fainting.
Outside of that, different models that use bleed air may have different susceptibility to problems, but they all use it.
https://matrix.itasoftware.com/search
any many others.
In practice not so much, because of so called "code sharing" of flight numbers.
https://en.wikipedia.org/wiki/Codeshare_agreement
Which can lead to sudden surprises, because the plane/carrier changed for whichever operational reasons at the last minute.
Anyone have any alternatives?