BlueEFFICIENCY Power engines with BlueTEC 6 are not only impressive because of their enormous economic efficiency, but also because of their excellent environmental compatibility. The engines ensure a drastic reduction in nitrogen oxides and particles in exhaust gas. Pollutants have reached the detection limit as a result. Independent investigations confirm that Citaro emission levels are even considerably lower than Euro VI limits under practical conditions. An impressive advance that once again sees the public service bus exceeding all expectations.