SOURCE: Whet Moser, Chicago Magazine

Last week, two small white fixtures, each a bit bigger than a human head and looking like an upside-down stack of Tupperware bowls, were mounted on lightpoles at Damen and Cermak and Damen and Archer. Inside the fixtures are environmental sensors, designed to measure air quality, weather conditions, light, vibration, and magnetic fields, plus a microphone for detecting decibel levels and a camera capturing still frames. (A Bluetooth modem that caused some concern a while back has been scrapped.) Small Linux-based computers process the data and pass it on to Argonne National Laboratory.