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Air pollution a leading cancer cause: WHO

October 18 2013, 10:38

International health experts have found "sufficient evidence" that outdoor air pollution is a leading environmental cause of cancer deaths.The World Health Organization (WHO) has classified outdoor air pollution as a leading cause of cancer in humans, sbs.com.au reports.

"The air we breathe has become polluted with a mixture of cancer-causing substances," said Kurt Straif of the WHO's International Agency for Research on Cancer (IARC).

"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."

The IARC said a panel of top experts had found "sufficient evidence" that exposure to outdoor air pollution caused lung cancer and raised the risk of bladder cancer.

Although the composition of air pollution and levels of exposure can vary dramatically between locations, the agency said its conclusions applied to all regions of the globe.

The IARC said pollution exposure levels increased significantly in some parts of the world in recent years, notably in rapidly industrialising nations with large populations.

The most recent data, from 2010, showed that 223,000 lung cancer deaths worldwide were the result of air pollution, the agency said.

The data did not enable experts to establish whether particular groups of people were more or less vulnerable to cancer from pollution, but Straif said it was clear that risk rose in line with exposure.

In the past, the IARC had measured the presence of individual chemicals and mixtures of chemicals in the air - including diesel engine exhaust, solvents, metals, and dust.

Diesel exhaust and what is known as "particulate matter" - which includes soot - have been classified as carcinogenic by the IARC.

The latest findings were based on overall air quality, and based on an in-depth study of thousands of medical research projects conducted around the world over decades.

"Our task was to evaluate the air everyone breathes rather than focus on specific air pollutants," said the IARC's Dana Loomis.

"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," he added.

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