Fresh air polluted by exhaust fumes and industrial emissions causes lung cancer, a team of World Health Organisation experts has officially declared.
Outdoor air pollution was officially classified as carcinogenic to humans by the cancer arm of the WHO after a review of the latest scientific evidence from around the world.
The International Agency for Research on Cancer (IARC) also highlighted an apparent link between air pollution and an increased risk of bladder cancer, although the findings were less conclusive.
Levels of pollution vary widely between urban and rural areas, but the working group said their findings applied to all regions of the world, and sent a “strong signal” to governments to tackle the problem immediately.
Dr Kurt Straif, head of the IARC Monographs Section which identifies environmental causes of cancer, said: “The air we breathe has become polluted with a mixture of cancer-causing substances.
“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 latest available data suggest that in 2010, air pollution was responsible for the deaths of 223,000 lung cancer patients around the world.
Scientists from the IARC studied more than 1,000 academic papers on polluted air and, separately, small particles found in polluted air.
They found that the risk of developing lung cancer rises in tandem with increasing levels of either, concluding for the first time that outdoor air pollution is a cause of cancer.
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