Onondaga County is urging residents to test their homes for the presence of radon.

Health officials say some homes in the county are at higher risk for exposure to radon, which can cause lung cancer.  They say it occurs after a long exposure to radon, which naturally occurs in rocks underneath homes.

Residents can obtain a free radon test kit from the county by calling them at 435-1649.  It's left out for 2 to 3 days and then returned to the county for analysis.  If the presence of radon is confirmed, a mitigation system can be installed that can keep the radon from entering the home.