(NEXSTAR) — While some of the advice shared on NBC’s “The Office” is not necessarily actionable, a frequently shared sentiment from character Toby Flenderson may just be.

Toby, the human resources employee played by Paul Lieberstein, frequently asked for radon testing to be done in the office, at one point calling it a “silent killer.”

Technically speaking, he isn’t far off.

“Radon is colorless. It is odorless,” Amanda Koch, the radon program manager at the Wisconsin Department of Health Services, explained to Nexstar. “There are no obvious signs for when radon is inside your home.”

Radon is formed naturally when radioactive metals uranium, thorium, and radium break down in rocks, soil, and groundwater, the U.S. Environmental Protection Agency explains. Because it is naturally occurring, we’re always exposed to it, but it is also capable of coming into buildings through cracks and gaps. If radon becomes trapped in your home, it can become dangerous.

Despite its prevalence, there is no known level of radon that is safe, according to the Centers for Disease Control and Prevention. The EPA recommends taking action if your home or building is found to have a radon level higher than 4.0 pCi/L.

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