concerning webpage - http://www.azgs.az.gov/hazards_radon.shtml ,
I am a certified radon testing and mitigation provider in Flagstaff. The information on your web page (above) about radon is misleading - saying AZ has some of the lowest radon levels in the USA. Through residential testing in the Flagstaff area since 2009, I have found elevated radon levels that are equal to or as high as other states in the western region. Please do more to emphasize the need to test every home and that testing is the only way to know for sure the radon level in a home. A broad statement like the one on your radon page is misleading.
The website you mention is not an ADHS website, it is run by the Arizona Geological Society. ADHS does not maintain a radon webpage. If you would like more information about radon, please contact the Arizona Radiation Regulatory Agency http://www.azrra.gov/radon/index.html or EPA http://www.epa.gov/radon/.