Mold

Is it common for Long Beach apartments to have mold? In bixby knolls area. We’ve had small bouts of white mold on our furniture, shoes, cabinets, etc. I know it has to do with ventilation and humidity - but I’ve been doing what I can to manage it: opening windows, turning fans on, using dehumidifiers, using humidity monitors to actually check %. Our apartment is older, and has older windows (so, not the best ventilation/insulation). Just wondering for any other tips or if there’s anything else I can do as a tenant besides clean it. Is this common? Maybe it’s a general apartment thing, but I’ve never had this at a past apartment I’ve lived in a different city. Do you guys experience mold of any kind?