Source: Jim Dallke, ChicagoInno

Chicago's ambitious and first-of-its-kind urban sensing project just took a major step forward as officials are installing the first 50 nodes around the city to measure things like air quality, traffic, and other city issues.

This week marks the first phase of the Array of Things project as nodes are being placed on traffic lights in The Loop, Pilsen, Logan Square, and along Lake Michigan. The first two nodes were installed last week at the intersections of Damen and Archer Avenues and Damen Avenue and Cermak Road. The first 50 nodes will be in place by September.