Sean
We have huge fluctuations in humidity here in Toronto, During the winter months we actively raise the humidity in the darkroom and in the print finishing area , primaraly to flatten the fibre prints, it is a real problem,
Idealy if you could keep the humidity between 45-65% most dust and print curling problems will be lowered.
right now we are fighting with a new finishing space and are trying to raise the humidity near the hot press. We will be putting the press in a closed environment to keep the humidity higher during the winter months.
In my darkroom , I have a commercial humidifier hooked up to a hot water heater to keep the humidity level constant year round.
During spring summer , we have no problem as the humidty is very high.