Put away the Ouija board and take out the Pledge.
Ghostbusters at Clarkson University in New York are investigating the link between indoor air quality and ghostly sightings, according to Medical Daily. They say toxic mold can trigger psychosis and that might cause you to see and hear things that go bump in the night.
The more sensitive you are to mold, the more likely you may think you're up against a poltergeist, the website reports.
“Hauntings are very widely reported phenomena that are not well-researched,” says Clarkson engineering professor Shane Rogers, according to the university's website.
"[The ghost sightings] are often reported in older-built structures that may also suffer poor air quality," Rogers says.
"Similarly, some people have reported depression, anxiety and other effects from exposure to biological pollutants in indoor air. We are trying to determine whether some reported hauntings may be linked to specific pollutants found in indoor air."
Rogers describes himself as a "longtime fan of ghost stories," and that he doesn't see himself as a paranormal debunker.
"What I do hope is that we can provide some real clues as to what may lead to some of these phenomena and possibly help people in the process."
Rogers' team of undergraduate students plan to measure air quality in several haunted locations in upstate New York, including the Frederic Remington Art Museum in Ogdensburg, N.Y. The museum is the former home of Madame Vespucci, and, according to Haunted Places, her voice can be heard echoing from the museum's upper level at night.
If they come back alive, they plan to publish the results of their finding.