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Diesel engines have become the “workhorse” of industry. They are the prime power source for many industrial and commercial applications because of their reliability, rugged construction and fuel economy. The presence of particulate matter in the exhaust gas, however, has “tarnished” the diesel engine's image. Soiling, visibility reduction and potential health effects are some of the problems being associated with diesel particulates. Extremely stringent U.S. and European heavy-duty on-highway standards have been implemented, resulting in clean burning diesel engines for truck and bus applications. Some engines are just below, or slightly exceed, the legislated particulate standards. Meanwhile, the U.S. EPA, the State of California and the European countries have developed (or are in the process of developing) exhaust emission regulations for industrial engines, to be implemented in the mid/late 1990s, which also contain particulate standards.