Kevin Campbell, Manager of Fleet Services at the City of Chicago’s Department of Fleet and Facility Management, aims to conserve across a network of more than 3,000 police vehicles, 500 garbage trucks, 300 salt-spreader trucks, 125 street sweepers and 100 ambulances — a total fleet of more than 12,000 vehicles. A handful of measures, from idling standards, to drastic nitrogen-oxide emissions reductions, keeps this massive fleet from heavily polluting Chicago’s air supply. “Motor vehicles account for nearly half of air pollutants,” Campbell says. “Anything we can do to reduce [the City of Chicago’s] output is pursued aggressively.” Visit the City of Chicago Department of Fleet and Facility Management website. Kevin Campbell originally appeared on Green is Good on June 3, 2013.