A bill in the Florida House of Representatives, HB 1191, could potentially allow the state to pave its roads with phosphogypsum – a mildly radioactive waste material used in the fertilizer industry. The U.S. Environmental Protection Agency (EPA) says that phosphogypsum is a waste product from manufactured fertilizer that emits a radioactive gas called radon. It also contains the radioactive elements of uranium, thorium, and radium.