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Diurnal and Seasonal Variation of CO2 in Urban Areas from Cluj County. This study shows the influence of the anthropic factors (urban agglomeration, economical activities, traffic) and the ecosystems upon the urban CO2 budget, during six months in 2008 (July-December). For this study, there were established three different locations from Cluj County: Cluj-Napoca, Turda and Huedin. In each of them, we chose city points with intense anthropic activities, and some reference points with a minor anthropic impact. The data show a significant variation for the CO2 level from one area to other, depending on the size of the urban agglomeration. There were also observed diurnal variations of the CO2 level, influenced by the ecosystem activity through photosynthesis.

Keywords: CO2, urban agglomeration, diurnal and seasonal variation