What different methods exist to clean-up diesel engine exhaust?
Original equipment manufacturers (OEMs) are continually improving new engine design to maximize fuel efficiency and reduce emissions, primarily PM and NOx. The emissions profiles of new or older engines can be improved through the use of newly developed exhaust after treatment products, including catalytic converters. Moreover, the fuel itself can be oxygenated to increase combustion efficiency and thus reduce emissions. Carbon dioxide, a major greenhouse gas, is a somewhat different pollutant and can only be reduced by cutting back vehicle use, significantly improving vehicle and engine efficiency, or employing renewable oxygenated fuels such as ethanol.
