WHO agency classifies diesel exhaust as carcinogen

Lobbyists for the diesel industry argued the study wasn't credible because researchers didn't have exact data on how much exposure miners got in the early years of the study; they simply asked them to remember what their exposure was like.

Further restrictions on diesel fumes could force the industry to spend more on developing expensive new technology. Diesel engine makers and car companies were quick to point out emissions from trucks and buses have been slashed by more than 95 percent for nitrogen oxides, particulate and sulfur emissions.

“Diesel exhaust is only a very small contributor to air pollution,” the Diesel Technology Forum, a group representing companies including Mercedes, Ford and Chrysler, said in a statement. “In southern California, more fine particles come from brake and tire wear than from diesel engines.”

A person's risk for cancer depends on many variables, from genetic makeup to the amount and length of time of exposure to dangerous substances.

Some experts said the new cancer classification wasn't surprising.

“It's pretty well known that if you get enough exposure to diesel, it's a carcinogen,” said Ken Donaldson, a professor of respiratory toxicology at the University of Edinburgh who was not part of the IARC panel. He said the thousands of particles, including some harmful chemicals, in the exhaust could cause inflammation in the lungs and over time, that could lead to cancer.

But Donaldson said lung cancer was caused by multiple factors and that other things like smoking were far more deadly. He said the people most at risk were those whose jobs exposed them to high levels of diesel exhaust, like truck drivers, mechanics or miners.

“For the man on the street, nothing has changed,” he said. “It's a known risk but a low one for the average person, so people should go about their business as normal ... you could wear a mask if you want to, but who wants to walk around all the time with a mask on?”

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