Just started a new job this year, but I've been falling sick way more than usual. Would it be wise to look for another job? Any tips?

Ask yourself, are you happy now? and then ask yourself, will you be happy with this in 5 years time? take all the replies here and input, but really sit with yourself. No one knows you better than you do

Maybe you can feedback to the management and get them to fix the issue?

At least try to provide your feedback to them.

The market isnt very good right now, people are being laid off so its not very wise if you keep changing jobs because of ventilation issue.

Im sure there is a proper way to handle this issue and running away isnt a good solution.