Mold is a natural spore found in our environment, both indoors and outdoors. It can enter your home through doors or windows, as well as HVAC systems, even on pets! Once these microscopic organisms are exposed to moisture, they thrive quickly and become problems within days if water sources do not control them and promote their growth with humidity levels as high as 30% to 50%. You may notice an unpleasant odor when this happens, but before you begin remediation steps, make sure you find out what is causing the mold.