Sunlight liberates nitrogen from urban grime

Cities are dirty. That’s obvious from all the grime that collects on glass, metal and other urban surfaces. But new research shows that not everything in that grunge is staying put at ground level, and that the grime — and the nitrogen in it — is contributing to air pollution in ways scientists aren’t accounting for.
 

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Sam Lemonick

Sam Lemonick (www.samlemonick.com) is a freelance writer based in Berkeley, Calif.

Thursday, December 24, 2015 - 06:00