Concentration and delta13C variation of atmospheric carbon dioxide near car traffic routes

Results of CO2 concentration and delta13C measurements in the atmospheric air sampled in Cracow and neighbourhood at the points of different influence of automobil exhaust gases are presented. Observed maximum the CO2 concentration at heavy traffic cross-road reached value 419 ppm while delta13C = -9.2%o. The CO2 concentration and delta13C values show correlation for either four sampling points. In the case of domination natural daily fluctuation of CO2 simple mixing model fits very well. Fluctuations determined by anthropogenic CO2 cannot be described by this model indicating different type of correlation. (author)