I actually completely agree with the PP.
You've uttered every excuse to get around yourself and your role meaning you are entitled to the special treatment.
I wonder if wearing a plaque on your chest and back, in bright yellow bold print - 'VERY IMPORTANT IMMUNOCOMPROMISED HIGHLY SKILLED TEACHER. UNABLE TO WORK WITHOUT WINDOWS OPEN. DO NOT CLOSE WINDOWS OR ILL DIE.'
Will help? Because, clearly, you are the most important person on that bus and therefore, everyone must do as you please.
I don't believe for a second that there's multiple other people on the bus that also require a window to be open, and if so, how uncomfortable that bus must be for others who may have health conditions which could be flared up by the cold.
As another person's noted, being next to the open window will do nothing direct to yourself, only cause a cold draft for those behind you.
Your theory, is a manifestation of your fear. Your fear is regarding being ill and catching illness from the bus, therefore you are creating a negative experience each time you get onto the bus, preempting this battle. You likely live in such fight mode, that does nothing for your health either.
You blame all the other individuals on the bus, but cannot find another reasonable solution?
I'd assume your role does not include a phyiscal subject such as Physical Education.
So, why is it not possible to work from home?
Or, commute by taxis the days you do work?
Why is it not possible to move closer to the school?
Why is it not possible for you to walk?
Are you taking all the relevant precautions since you become so unwell? And in each setting where you are in closed contact?
Such as a high quality masks? Hand sanitisation? Ensuring you are at the front of the bus, therefore each time the door open and shuts you get the direct benefit of the air flow change?
You can happily ask someone to move so you can be closer to the doors. I think that's more justified than upsetting the whole bus, to suit you.
I say that it must be uncomfortable for others on the bus, due to your, I would assume obvious upset each time you are is obvious.
I think you really need to dig deep and try and resolve that hatred and anger you have inside of you. Your focus is on your ego, subconsciously or consciously.
There's a lot of research that notes how stress causes further impact on your health.
I'm sorry, but, there will always be another you.
Your job is replaceable.
Your causing all these issues, yourself.
Your job is not more important than your health.
You are not more important than any body else.
If you're seriously that unwell, you need to think about resolving the issues you are having instead of placing such issues with work.
You are letting people down, because the cycle continues because you refuse to stop it.
You leaving will trigger a need for a replacement, even if you state they've tried.