Question about Xiaomi Mi Air Purifier 3C

It can help you to reduce the odor from cooking but will not reduce the humidity.

Na, that's not going to solve your problem if you cook meat in oil. It will be saturated in a a week, latest. I'd rather think the previous resident just removed the filters, in order not to be responsible for it. Are you sure you cannot put something like that in the hood ?
https://www.doitgarden.ch/de...

I'd suggest you to talk to the owner of the flat/landlord and show him the problem.