Mold is a type of fungus. It is present almost everywhere, including the air. In general, normal amounts of mold in the environment do not pose a substantial health risk to healthy people with regular immune system function.
Some people believe that black mold is particularly dangerous because it releases mycotoxins. However, the fact is that all molds are capable of producing mycotoxins. Just because mold is present does not mean that it is producing these toxins. Most cases of mycotoxicosis result from eating moldy food, rather than from inhaling fungal spores in the home or outdoors. The evidence does not indicate that inhaling or touching mold can cause mycotoxicosis.