Ozone Concentration at Ground Level Depending on the Content of NO_x and Meteorological Conditions

This study analyzed the temporal variation of tropospheric ozone (O₃) in Poznan (midwestern Poland) on the basis of data collected from a State Environmental Monitoring air quality assessment station. The aim was to investigate the distribution and variation of O₃ levels and to assess the relationship with nitrogen oxides (NO_x) and meteorological conditions. These relationships were assessed by multiple regression analysis and cluster analysis. The O₃ levels showed a high annual, seasonal and daily volatility, and were significantly influenced by meteorological conditions and NO_x levels. High O₃ levels were accompanied by above-average levels of radiation (Rad), air temperature (T_a) and wind speed (W_s), together with below-average values of NO_x and humidity (R_h). Atmospheric pressure (P_h) had an ambiguous effect on O₃ levels.