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.
 

Full content for EARTH is available to subscribers. If you would like to gain access to the full version of this article, as well as all EARTH content, please subscribe today.

If you are connecting using a Library (IP-based) Subscription, please access full issues of the magazine through our Library Access portal.

Sam Lemonick

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

Thursday, December 24, 2015 - 06:00

Did you know ...

EARTH only uses professional science journalists and scientists to author our content?  In this era of fake news and click-bait, EARTH offers factual and researched journalism. But EARTH is a non-profit magazine, and at least 10 times more people read EARTH than pay for it. As advertising revenues across the media decline, we need your help to ensure that we can continue bringing you the reliable and well-written coverage of earth science you know and love. Our goal is not only to inform our readers, but to inform decision makers across the economic and political spectrum about the science of our planet. So, we need your help. By becoming a subscriber or making a tax-deductible contribution to support EARTH, you can fund our writers and help make sure the world knows about our planet.

Make a contribution

Subscribe