October 17, 2013
The International Agency for Research on Cancer (IARC) said air pollution from traffic and industrial fumes was a definite cause of lung cancer and also linked to bladder cancer. The strong verdict from IARC, a cautious body that pronounces only when the evidence is strong, will put pressure on governments to take action.
"The air we breathe has become polluted with a mixture of cancer-causing substances," said Dr Kurt Straif, head of the IARC monographs section, which assesses evidence and publishes official warnings. "We now know that outdoor air pollution is not only a major risk to health in general, but also a leading environmental cause of cancer deaths."
Air pollution is already known to increase the risks for other diseases, including heart and respiratory disease. The numbers of those exposed to air pollution have risen rapidly as countries have industrialized. The most recent data suggests there were 233,000 deaths from lung cancer caused by air pollution around the world in 2010.
IARC monitors studies on cancer risks and issues official monographs when it has come to conclusions about a potential carcinogen. It has put out warnings about individual chemicals in the air. Diesel engine exhaust, solvents, metals and dusts have all been labelled carcinogenic. This is the first time it has classified air pollution in general as a cause of cancer.
Smog blankets Cairo. Photo by: Sturm58/GNU Free Documentation License.
"Our task was to evaluate the air everyone breathes rather than focus on specific air pollutants," said Dr Dana Loomis, deputy head of the monographs section.
"The results from the reviewed studies point in the same direction: the risk of developing lung cancer is significantly increased in people exposed to air pollution."
The main sources of air pollution are traffic, power stations, industrial and agricultural emissions and heating and cooking fumes from the home, the IARC said. The levels of air pollution vary from place to place, but every country in the world was affected and should do something about it, it said.
"Classifying outdoor air pollution as carcinogenic to humans is an important step," said the IARC director, Dr Christopher Wild. "There are effective ways to reduce air pollution and, given the scale of the exposure affecting people worldwide, this report should send a strong signal to the international community to take action without further delay."
Original story: Sarah Boseley. Air pollution can cause cancer, says World Health Organisation. The Guardian - October 17th, 2013
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