If you keep seeing ghosts around your house, your answer isn't Ghostbusters — you need to call someone slightly less cool: A certified and licensed mold removal specialist.

A study out of Clarkson University in New York found the main reasons people think their house is haunted are: dust, dirt, and mold.

The air quality in your place makes you more likely to see strange things floating around; and the toxic mold triggers psychosis in your brain.

Bad air quality and mold can cause other serious problems, besides paranormal visitors. They can also lead to depression, anxiety, and pretty serious illnesses.

So if you're seeing ghosts, you might want to get someone over to your house to remove the mold before you start having real issues.

If the ghosts still don't go away, then get a priest over there ASAP.