The chemistry flight as0729 performed on the 16th of July 2007, between 14h20 and 16h20 local time was dedicated to pollution tracking above the Moldavia province in Romania. We wanted to explore two urban agglomerations: Iasi (47 ́09N; 27 ́37E) and Roman (46 ́55N; 26 ́54E) distant about 50 km from one another in straight line. Industrial zones are implanted in these areas. We went to explore the vertical distribution of the pollutants above these two areas. Moreover, a European road passes by the north of the two cities. We also went to track traffic emissions. Trace gas species measured during the flight were NOx, O3 and CO. Our goal is to establish the lower troposphere distribution of these pollutants in the area, in order to evaluate the photochemical production of ozone in an urban/industrial plume. The aim of our experimental strategy is to cover a horizontal and vertical dimension of the region.