The Environmental Protection Agency (EPA) has still not complied with a subpoena issued August 1, 2013 by the House Science, Space and Technology Committee seeking the scientific foundation of virtually every Clean Air Act regulation the agency has issued. The subpoena demanded that EPA Administrator Gina McCarthy hand over data from two decades-old taxpayer-funded studies as the agency moves towards the adoption of strict new ozone standards that could cost the U.S. economy $90 billion annually—which would make them the most expensive regulations in U.S. history. The subpoenaed data is cited as the scientific basis for EPA’s claim that microscopic...