carcinogen

Long-term exposure is even worse, with the EPA website noting that “EtO is a human carcinogen. It causes cancer in humans.”

"Large quantities of dioxin and furan have been added to the atmosphere and these are carcinogens. And then we have calculated it may kill about 70 people in our country," says Prof Guneeardena.

The test results also found high levels of chromium — which, in some chemical configurations, is a carcinogen — on one campus.

When scientists found a carcinogen in the drinking water of Santa Rosa, Calif., after the Tubbs fire, it triggered a race to develop measures to keep residents safe.

The Environmental Protection Agency does not consider it a carcinogen; however, exposure to barium can cause gastrointestinal irritation, cardiovascular effects, kidney damage and respiratory problems.