People needing a new Volvo truck next year will have to pay an extra $9,600 on top of the regular price. Volvo Trucks North America says the surcharge is a result of extra costs associated with selective-catalytic reduction [SCR] in its 2010 diesel engines. SCR uses urea, a diesel exhaust fluid, to scrub nitrogen oxides from the tailpipe. New electronic controls monitor the process. U.S. Environmental Protection Agency rules dictate that by Jan. 1, all onroad diesels will have to meet near-zero NOx levels. Next year, Volvo will offer trucks with its own 11-, 13- and 16-liter engines as well as a Cummins 15-liter engine, all with SCR.