You can’t see, smell or taste radon gas, but the silent killer could be lurking in your home. Radon is actually the second leading cause of lung cancer in the U.S. and causes more than 21,000 lung cancer deaths per year.

The U.S. Environmental Protection Agency has declared January as National Radon Action Month in an effort to bring awareness to this naturally occurring radioactive gas. Because radon is a gas, it is everywhere.