Particle Falls Philadelphia in The Big Story (Associated Press)

November 4, 2013 - Philadelphia, PA

(Image on Right) 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)

(Image Below) A pedestrian stands in the median on Broad Street as Particle Falls, a temporary public art installation by Andrea Polli, 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)

(Image Above) Cars drive on Broad Street past 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)

Link to The Big Story: Image 1, Image 2, Image 3

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