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High particulate emissions from diesel vehicles showing high strength and reliability have led to the evolution of many new technologies as well as the formulation of legal restrictions. One of the ways to reduce emissions from combustion of diesel fuel is to use the dual fuel system. Methane and hydrogen are most often considered as an additional fuel for use in a diesel engine. The combustion process and thus the emission are determined i.e. by fuel atomization and injection methods. The motivation to undertake the research is the need to define how the applied hydrogen injection will influence particulate emissions during the combustion process in a dual fuel diesel engine. Research has been conducted to compare the particulate emissions during engine operation with early and late direct injection of hydrogen. The research object is a four-cylinder, four-stroke ADCR engine produced by Andoria-Mot with a displacement of 2,636 cm3.