AUSTIN, Texas (AP) — Environmental groups in Texas want to overturn a state action they say exempted large coal-fired power plants from federal limits on particulates and other pollutants during startup, shutdown and maintenance at 19 power plants. A release from the Environmental Integrity Project on Wednesday says the exemptions made by the Texas Commission of Environmental Quality between 2010 and 2013 show a "chronic disregard of federal Clean Air Act standards.Read more on NewsOK.com