Air pollution
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If you want to avoid lung cancer, the United Nation’s cancer-research body has some advice for you: Don’t breathe.

The International Agency for Research on Cancer on Thursday added air pollution, and the particulate matter that it contains, to its list of carcinogens.

The airborne poisons were classified as “Group 1” carcinogens, meaning there is “sufficient evidence” that they cause cancer in humans. They are mostly produced through the burning of fossil fuels in vehicles, power plants, and stoves.