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The scope of this article is to determine the necessity of introducing clean transport zones. It is caused by a successively increasing number of vehicles and an increase in the average age of vehicles running on the roads. These factors negatively affect the air quality due to road emissions. The population inhabiting urban areas is particularly exposed to poor air quality, where the concentration of tall buildings and the absence of free airflow contribute to increased levels of exhaust congestion. To overcome these issues, many authorities in urban centers, particularly in Europe, are choosing to introduce clean transport zones. The main aim of the work is to present the selected environmental benefits, if a potential clean transport zone were introduced on example of Poznan city in Poland. Variety of factors were taken into consideration and a multi-parameter model was created. A precise study area of approximately 2 km2 was defined as one of the suburban residential area, with a population of approximately 10,000. The parameters of the model included the intensity of vehicle traffic, the share structure of emissions and the type of propulsion of vehicles moving through the area. The age structure of the vehicles was determined using images of the number plates from the VIDAR ANPR+ camera and the vehicle database. In order to quantify real-world emissions as a function of average speed at a given point, the approximation equations available in the literature were used with division into fulfilling assigned emission standards. The additive model allowed the total mass of a selected compound emitted to be calculated based on the real structure of vehicles moving through the study area. The potential environmental benefits were taken as a percentage reduction in emissions of the individual compounds. On the basis of the data obtained, three different versions of the introduced restrictions were determined. The variants affected respectively 5, 15 and 39% of the vehicles travelling through the study area. In the first case, significant environmental benefits were obtained in the reduction in CO and HC emissions by about 20%, and NOx emissions by up to half. The second option involved changing the share by changing the oldest vehicles into electric ones. A reduction of several per cent in CO2 and CO emissions was achieved, HC and NOx were halved. The last option, banning diesel vehicles from the zone, had the greatest effect with a 98% reduction in NOx emissions. Study shows that, despite affecting a small group of vehicles, there is a significant impact on lowering NOx emissions, which in urban conditions also contributes to human health benefits. In the future, the model will be further developed with the introduction of the Euro 7 standard and other areas will be examined.