Particle Falls Philadelphia

Particle Falls Philadelphia

Pedestrians walk underneath Particle Falls, a temporary public art installation by Andrea Polli, which is being projected on the face of the Wilma Theater, Thursday, Sept. 26, 2013, in Philadelphia. The light display represents real time air quality as detected by a nearby monitor and runs every evening from Sept. 26 through Dec. 1. (AP Photo/Matt Slocum)

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