Chicago Mayor Rahm Emanuel wants to make a deal with diesel truck owners in the Chicagoland area: give up your truck, and the city will give you a voucher that covers around 60 percent of the cost of a new electric one. Officials say the project could help with air quality and even quieter streets across the city. By next spring, fleets in Cook, DuPage, Kane, Lake, McHenry and Will counties will be able to apply for the program. “The city is encouraging companies to invest in electric vehicles in order to incrementally improve Chicago’s air quality while helping to...