Mold is just part of our environment. Molds are generally formed from dead leaves and trees. It is easily visible by our naked eyes. But sometimes it is not visible and dangerous. So you need to do mold inspection and testing to solve your problem.
MD Cleaners are always here to help you. Cheers!! 
Mold can definitely be a big deal especially if the person has severe allergies or compromised immune/respiratory system.
If anyone would like to purchase an indoor air quality sampling pump, I’m selling mine. Here’s a link if interested…
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Zefon BIO-PUMP PLUS ZBP-200 mold AIR QUALITY spores TEST KIT tester CASE unit