Indoor Environmental Concerns - Indoor Air Quality
Indoor radon gas is a national health problem. Radon causes thousands of deaths each year. Millions of homes have elevated radon levels. Most homes should be tested for radon. When elevated levels are confirmed, the problem should be corrected.
"SP688-Radon in Tennessee," The University of Tennessee Agricultural Extension Service, SP688-1/07-1M R12-5310-060-019-07 07-0140, http://trace.tennessee.edu/utk_agexenvi/4