Everyone knows that breathing polluted air is bad for one's health. Now comes news that you don't even have to breathe a lot of it.

Italian scientists report that inhaling polluted air for as little as three days can cause some genes to undergo reprogramming, which may affect a person's risk of developing cancer and other diseases.

In a paper presented at the International Conference of the American Thoracic Society in San Diego, the scientists compared the blood DNA of healthy ...

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