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This paper investigates the impact of hydrogen (H₂) addition on the exhaust emissions of a 2004 Mack MP7 355E heavy-duty diesel engine. As expected, the addition of H₂ reduced substantially the emissions of particulate matter (PM), unburned hydrocarbon (HC), and carbon dioxide (CO₂). However, the effects of H₂ addition on the emissions of carbon monoxide (CO) and oxides of nitrogen (NO_x) depended on the amount of H₂ added and engine load. For measurements using the 13-mode European Stationary Cycle (ESC), the addition of 2% and 4% H₂ (vol.% in intake mixture) increased substantially the nitrogen dioxide (NO₂) emissions but reduced the emissions of nitric oxide (NO). The addition of H₂ only minimally affected NO_x emissions. The detailed effects of H₂ addition on the exhaust emissions were investigated for various loads at 1200rpm. The addition of H₂ at low load mildly influenced NO_x …