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Government officials took the unusual step of closing some of the freeways in Beijing earlier this month, the latest in a series of increasingly frantic efforts to reduce the city's seemingly endemic problems with air pollution so severe that many residents now walk around wearing masks to reduce the amount of soot and smoke they breathe.
They have reason to worry, warns a new study released by the International Agency for Research on Cancer, a research arm of the World Health Organization. The agency has formally declared what many medical experts have long suspected: Air pollution causes lung cancer.
The study points an accusing finger at a variety of sources, including the coal-burning power plants of China, the widespread agricultural operations of California—and the diesel cars and trucks found all over the world.
"The air most people breathe has become polluted with a complicated mixture of cancer-causing substances," said agency department chief Kurt Straif told The Associated Press, warning that air pollution is now considered to create a more serious risk of lung cancer than second-hand cigarette smoke. The agency contends that more than 220,000 people around the world died in 2010 due to cancers arising from air pollution.
(More from The Detroit Bureau: Bucking the trend, Ford increasing US exports to China)
The study follows up on earlier reports that warned about the risk of specific types of air pollution. It contends that pollutants have become so ever-present that in many parts of the world the simple act of breathing puts people at risk for not just lung but possibly other cancers including that of the bladder.
A major concern is the presence of particulates, super-fine particles of soot and other substances that can find their way deep into the lungs. That's been a particular concern for those who oppose the expanded use of diesels.
"People can certainly contribute by doing things like not driving a big diesel car, but this needs much wider policies by national and international authorities," Straif said.
It's not the first time the World Health Organization has taken aim at the diesel engine. It declared diesel exhaust "a known carcinogen" in a June 2012 report. But the WHO decision was somewhat nuanced, suggesting that the problem was more severe in emerging markets than in countries like the U.S.—and particularly in Europe, where diesel is the powertrain option of choice in roughly half of all new vehicles sold each year.
(More from The Detroit Bureau: Automakers Migrating South of the Border)
That's because so-called "clean diesel" technology uses a variety of filtering techniques to not only reduce the emission of smog-cancer oxides of nitrogen, or NOx, but also those ultrafine particulates. In fact, contends Scott Keogh, head of Audi's U.S. sales arm, the maker's latest diesel models may produce less of this soot in their exhaust than some gasoline-powered vehicles.
Audi isn't the only automaker to be concerned about the new air pollution study. German automakers in general have been increasing their range of diesel offerings in the big U.S. market as more consumers show interest in the high-mileage technology. Audi has three new diesel models coming to market for 2014, while BMW and Mercedes-Benz are expanding their own lineup. But other makers, including Chevrolet, Mazda and Chrysler, also are adding so-called "oil-burners."
Many Americans still remember the diesels of decades' past, with their rough ride and foul-smelling smoke. Even among those aware of the new "clean diesel" technology, not everyone has warmed to the latest powertrains. California clean air regulators continue to put new hurdles in front of diesel engineers demanding they do an even better job of eliminating particulate and NOx emissions.
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But there are also proponents among environmentalists who counter concerns about diesel pollution. They not only defend the latest emissions control systems but note that diesel also produces less CO2, the gas directly linked to global warming.
Significantly, two diesel models—the Audi A6 TDI and the 328d—were among the five finalists for Green Car of the Year. Only one hybrid was named to the list while the two other models were advanced versions of conventional gasoline technology.
"I'm suspicious" of the new research that paints all forms of diesel power with the same carcinogenic brush, Ron Cogan, founder of the Green Car award and publisher of Green Car Journal, told TheDetroitBureau.com. "I want to know what their science is."
Cogan argues that "every technology has its issues," and that the latest diesel powerplants, which may rely on dirty coal plants for their power, are about as clean as anything on the road, including electric vehicles.
Whether the new study will lead regulators to rethink diesel power – perhaps by demanding even more stringent emissions control systems -- remains to be seen.