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The U.S. Bureau of Mines is conducting laboratory evaluations of the effectiveness of oxidation catalytic converters (OCC's) for application on diesel engines used in underground mines. The composition of the exhaust emitted from a diesel engine depends critically upon the fuel-to-air ratio (F/A). The F/A changes significantly with altitude, requiring regulatory derating of engines used at altitudes above 0.30 km (1000 ft). It is important to evaluate exhaust control devices for application on mining vehicles at various altitudes because mines are located at a wide range of elevations. The objective of this work is to determine the characteristics and performance of an OCC at various altitudes as well as investigate an altitude simulation technique used in a laboratory setting.