If snow is “driven,” it has been blown into drifts and untrodden-upon by filthy human heels. Sounds pure, indeed, but whoever coined the phrase didn’t have pollution to worry about.

According to Canadian researchers, pure white snow is a magnet for car exhaust pollution, absorbing enough toxins after one hour to make it dangerously inedible. So there you go, dads who make “yellow snow” jokes: Don’t trust the driven snow, either.

RD

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