What is the acceptable range of indoor humidity to prevent mold growth?

The acceptable range of indoor humidity to prevent mold growth is between 30% to 50%. Maintaining humidity levels within this range creates an environment that is generally inhospitable to mold spores, which tend to thrive in more humid conditions. Mold requires moisture to grow, and levels above 50% can provide enough moisture for mold to develop. On the other hand, humidity levels below 30% can be too dry for many mold spores to successfully germinate and grow, but maintaining optimal humidity is crucial for overall indoor air quality and comfort. By keeping indoor humidity between 30% and 50%, it helps to minimize the risk of mold proliferation and supports a healthier living environment.