United Nations: Diesel exhaust causes cancer

June 14, 2012

From the print edition

The World Health Organization’s (WHO) cancer research agency on Tuesday classified diesel-engine exhaust as cancer-causing, and urged action to reduce human exposure to it.

“Diesel-engine exhaust causes lung cancer in humans,” Christopher Portier, chairman of a working group at WHO’s International Agency for Research on Cancer (IARC), said in a statement.

There was also a “positive association” with an increased risk of bladder cancer, the U.N. body said.

“Large populations are exposed to diesel exhaust in everyday life, whether through their occupation or through the ambient air,” the statement said.

People are exposed to emissions of diesel cars, trains, ships and power generators, as are workers in fields such as underground mining.

“Given the additional health impacts from diesel particulates, exposure to this mixture of chemicals should be reduced worldwide,” Portier said.

Portier’s group on Tuesday also concluded that gasoline exhaust was possibly carcinogenic, a finding unchanged from its previous assessment in 1989.

The agency said environmental concerns had given rise to new regulations in the last two decades, notably in North America and Europe, resulting in a lower sulfur content for diesel, engine changes that burn fuel more efficiently and emission reductions through exhaust-control technology.

However, existing fuels and vehicles without the modifications will take years to be replaced, particularly in less-developed countries where regulatory measures are also less stringent.

The agency urged policy makers to work with engine and fuel manufacturers.

“The main studies that led to this conclusion were in highly exposed workers,” said the IARC’s Kurt Straif. “However, we have learned from other carcinogens, such as radon, that initial studies showing a risk in heavily exposed occupational groups were followed by positive findings for the general population.”

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