According to Westword, Colorado Public Health Agencies Are Raising the Alarm for Radon Testing.

The problem is, any level of radon is dangerous to human health. In Colorado, about 500 lung-cancer deaths occur annually as a result of radon exposure, and more than 20,000 such deaths occur in the U.S. every year, which makes radon the second leading cause of lung cancer after smoking, according to the U.S. Centers for Disease Control and Prevention.

Read more at: http://www.westword.com/news/colorado-offers-free-test-kits-for-national-radon-action-month-9920785