The distribution of pollutants in the atmosphere is key to the validation of dispersion models. While dispersion models
tend to assume that air masses are homogeneous, experimental measurements of pollutants using a LIDAR show a
different picture. Air masses are very complex and the concentrations of pollutants are influenced by multiple factors. In
this paper we present the influence of anthropogenic structures, i.e. a intersection with heavy traffic and a small village,
on the ozone concentrations in the atmosphere in their areas of influence. The data were collected using a LIDAR DIAL
in the UV region (λon= 280nm, λoff=286nm). The selected wavelengths correspond to the same absorption value on the
SO2 curve to avoid interferences. Measurements were conducted in two dimensions in order to determine pollutant
concentrations on certain planes in the atmosphere. The area under study was about 3,2 106 m2 in a circular sector,
ranging from -70 to 70 degrees in vertical angle, in 10 degrees steps, and 1,500 meters of radio. The resulting plane is
perpendicular to the ground. The results show that over the two man-made structures the concentration of ozone is lower
than in the rest of the area under study. The heavy traffic intersection is located 750 meters east of the LIDAR location,
and the village is 750 meters to the west. The LIDAR location was not established before hand with the purpose of
exploring the influence of the two man-made structures on the distribution of pollutants in the atmosphere, and we only
realized their significance upon analysis of the results. Different sets of data have been compared, focusing in particular
on the measurements during the night and in rush hours to better discern the influence of human activity on the
distribution of air pollutants.
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