The Environmental Protection Agency (EPA) did not consistently disclose health risks to human test subjects it used to study the risks of pollutants, sometimes keeping information about cancer possibilities from participants, the agency’s internal watchdog said Wednesday. The EPA’s Office of Inspector General (OIG) found that the agency obtained the proper approvals from participants before exposing them to airborne exhaust and diesel pollutants, including particulate matter, in 2010 and 2011. However, the consent forms were inconsistent in their disclosures and did not warn of potential long-term risks of exposure to the gases. “This was because they only planned to perform...