The Nation : Radon Guidelines Sought

Senators from Pennsylvania, New Jersey, New York and Maine asked the Environmental Protection Agency to issue guidelines clarifying the health risks posed by colorless radon gas. The federal government has yet to clearly tell people at what levels the radioactive gas becomes threatening, the senators said. As uranium decays naturally, it gives off colorless, odorless radon, which can seep through the ground into basements. The gas breaks down into radioactive solids, which can cling to dust and can harm tissues if inhaled.