http://aderadonmitigation.com - Radon is a radioactive colorless, odorless, tasteless noble gas released from the normal decay of the elements thorium, radium, and uranium in rocks and soil. It is an invisible, odorless, tasteless gas that seeps up through the ground and diffuses into the air. Radon gas usually exists at very low levels outdoors. However, in areas without adequate ventilation, such as underground mines, radon can accumulate to levels that substantially increase the risk of lung cancer. Radon-222 decays into radioactive elements, two of which – polonium-218 and polonium-214 emit alpha particles, which are highly effective in damaging lung tissues.