[ Ссылка ] - Radon is naturally occurring, odorless, and colorless gas produced by the breakdown of uranium in soil, rock, and water. Because radon is a gas, it can enter buildings through openings or cracks in the foundation. The radon gas itself decays into radioactive solids, called radon daughters. The radon daughters attach to dust particles in the air, and can be inhaled. The inhalation of radon daughters has been linked to lung cancer. The Environmental Protection Agency's limit for radon is 4.0 pCi/l, where the World Health Organization only allows 2.7 pCi/l before recommending action.
