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The work relates to the identification of traffic flow in the urban area, taking into account its categorization toxic exhaust emissions. The study was performed as part of an integrated project called LIFE: "Implementation of the Programme of air protection in Lesser Poland province – Małopolska in a healthy atmosphere". They constitute one of the components necessary for modeling the emission transport in Kraków. The scope of the work carried out in the Cracow University of Technology included, among others, field tests measure traffic within the administrative boundaries of the Municipality of Kraków. These studies were conducted on selected days of the week during the peak morning and during the afternoon rush, as well as a day off from work on selected streets, in the same hours. Due to the limitations of the method used, the measurement system has been developed to identify the vehicles that are compatible with this measurement and guaranteed to get results with the required accuracy. For this purpose, a simplified system for vehicle identification based on COPERT system was introduced. The applied division, in which the selected groups of vehicles were combined, takes into account the specifics of the domestic car fleet, including the participation of the vehicles with a great degree of exploitation or the ones with the after treatment system removed in traffic. The measuring team was a group of 150 trained students of the Faculty of Mechanical Engineering of Technical University of Cracow. The measurements of stream traffic were held at 36 typical streets of the road network of the Municipality of Kraków, including: highway, main street, main street with accelerated motion, principal street with tram track, principal street with the tracks in the median strip, a local street with tram track, collective street and cumulative street with tracks in the road. The studys conclusions apply to the analysis of the obtained results of the research on traffic flow of vehicles on specific sections of the road network, they constitute an important contribution to the development of a model of pollutant transport in Kraków agglomeration.