HELENA—Winter is the best time to test your home for radon according to Paul Tschida, radon specialist for the Montana Department of Environmental Quality’s Radon Control Program.

“Testing for radon when your doors and windows are closed typically provides the best results to determine ‘worst-case’ radon levels in your home,” said Tschida. “That’s why January is National Radon Action Month, during which the program encourages testing.”

If test results are elevated, mitigation is recommended. Radon is a naturally occurring radioactive gas that can cause lung cancer. The c...