Particulate and smoke emissions were studied in the exhaust of a Mercedes Benz type OM 616 diesel engine. The weight and size distribution of the particulate matter emitted and the intensity of the smoke were measured at different engine loads and at various constant speeds in the range 35-96 km h_1. The level of the particulates emitted during a simulated seven-mode Federal Test Procedure was also determined. The results showed that both the particulate and smoke emissions were highly dependent on engine speed and load. The particulate matter collected was analyzed for its chemical composition, showing that 60-75 wt % of the particulate matter was organic compounds.

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