"The U.S. Environmental Protection Agency failed to disclose cancer risks to volunteers used in research studies on harmful pollutants, a government watchdog says.

The EPA, which warns of dangers from diesel exhaust and tiny particles in its rules to cut pollution, recruited people for tests on those pollutants in 2010 and 2011. Consent forms they got didn’t mention cancer because the agency considered the risks minimal from short-term exposure, the agency’s Office of Inspector General said in a report yesterday.

'When justifying a job-killing regulation, EPA argues exposure to particulate matter is deadly, but when they are conducting experiments, they say human exposure studies are not harmful,' Louisiana Republican Senator David Vitter said in a statement, reacting to the report."

Mark Drajem reports for Bloomberg April 3, 2014. [2]