DES MOINES, Iowa (AP) — Congressman Bruce Braley says his first piece of legislation this year will call for mandatory radon testing and mitigation in school buildings nationwide. The Democratic congressman announced his plans Monday at the state Capitol. Radon is the second leading cause of lung cancer in the United States. All of Iowa’s 99 counties lie in the EPA’s highest risk zone for exposure to the colorless, odorless gas that leaks through cracks in building foundations.

Iowa law only requires radon mitigation in preschools. The End Radon in Schools Act would provide federal grant funding to high-risk states to test for radon and install mitigation systems. Mitigation systems cost school districts upward of $1,000. Braley hasn’t specified how much his bill would cost.