The agency conducted tests on people with health issues and the elderly, exposing them to high levels of potentially lethal pollutants, without disclosing the risks of cancer and death, according to a newly released government report.

These experiments exposed people, including those with asthma and heart problems, to dangerously high levels of toxic pollutants, including diesel fumes, reads a EPA inspector general report obtained by The Daily Caller News Foundation. The EPA also exposed people with health issues to levels of pollutants up to 50 times greater than the agency says is safe for humans.

The EPA conducted five experiments in 2010 and 2011 to look at the health effects of particulate matter, or PM, and diesel exhaust on humans. The IG’s report found that the EPA did get consent forms from 81 people in five studies. But the IG also found that “exposure risks were not always consistently represented.”

“Further, the EPA did not include information on long-term cancer risks in its diesel exhaust studies’ consent forms,” the IG’s report noted.