Exhaust gas emissions from diesel engines contribute significantly to environmental pollution and pose health risks to humans, including respiratory problems, cardiovascular diseases, and adverse effects on ecosystems. The increase in pollutants such as nitrogen oxides (NOx), particulate matter (PM), carbon monoxide (CO), and hydrocarbons (HC) accelerates climate change and degrades air quality. This study investigates the exhaust gas emissions of a diesel engine operating on dimethyl ether (DME) as an alternative fuel. The research focuses on analyzing the impact of DME on key emission parameters such as NOx, CO, and HC compared to conventional diesel fuel. The research was carried out using a model of a four-cylinder diesel engine equipped with a direct injection system and a turbocharger. This model was created with the AVL Boost software. Simulations were conducted to evaluate engine emission characteristics under various operating conditions. Results demonstrate that DME combustion reduces carbon monoxide emissions due to its high oxygen content and clean-burning properties, while NOx emissions show a variable trend influenced by injection timing and combustion temperature. This investigation highlights the potential of DME as a sustainable fuel option to meet stricter emission regulations and reduce the environmental impact of diesel engines.