Research of CO2 emissions is not only important, but it is standard practice for homologation, technical inspections, registration of vehicles and for environmental greenhouse effect. Different agencies are taking into consideration the fact that greenhouse emissions are seriously impacting the climate change and events on the planet. Road traffic and transportation are, beside animal agriculture, the most significant polluters in dense areas, with high values of emissions. For diminishing the impact of automotive sector in the emissions field, the present work approaches the practical side of this topic. During the testing, some results will allow the definition of those conditions in which the pollutant emissions fall into control and are drastically diminished. Main objective of the paper is to research the CO2 emissions generated by a Diesel engine in a transient test cycle, both at cold operation and after warm-up phase. Second objective is to analyse the graphics from low speed and medium speed operation regimes. The CO2 emission are influenced by fuel consumption, engine speed and coolant temperature. Highway testing of CO2 emissions are to be made in further and advanced research.

Research of PM (particulate matter) emissions is very important in crowded areas with high values of road traffic and industrial sites because may affect the health significantly. To mitigate the health risks generated by motor vehicles, the present paper shows the applied research on this topic with the practical results. The first important objective of the paper is to study the characteristics related to particulate matter in emissions generated by a car in actual road traffic test. The second objective is to compare the results from cold and warm operation regimes. It is important to know the trendline of PM emissions during operation due to their influence upon health. The PM amount is influenced by engine speed, fuel consumption and other operational factors. High levels of PM were recorded at 1500 rpm because it was the upper point in which the gear ratio has been changed.

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