Urban Grime Can Contribute to Air Pollution

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The filthy, black grime crusting city buildings and statues isn’t just an eyesore. It’s also an unlikely contributor to lung-searing smog, according to Canadian scientists.

Pollution from cars, factories, and other sources can waft around until settling on surfaces as grime. Locked into this solid-looking state, it’s easy to assume it doesn’t do much after that until somebody power-washes it into oblivion. But according to James Donaldson at the University of

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