Molds are a type of fungus. Noy all Mold is toxic. They grow best in warm, moist environments. They thrive on digesting decaying organic materials. Mold does not use chlorophyll to produce food thats why mold does not need sunlight to survive. Without mold, the entire world would be overrun by dead plant matter, so it's an important part of the environment.
All spores found in indoor air are also normally found in outdoor air because most originate or live in the soil and on dead or decaying plants. Therefore, it is not unusual to find mold spores in indoor air. We become concerned when we detect elevated Mold inside your home or business.