Ozone (O3) is a secondary pollutant, considered a relatively short-lived greenhouse gas, and high concentrations of O3 are a concern because of its harmful impacts on human health and ecosystem functioning. The main objective of the study was to determine the seasonality, weekly variation of O3; identify the main sources of ozone precursor emissions and study the relationships between meteorological variables. O3 was measured in Campo Grande, Brazil, from January 1st to December 31st, 2021, and used the Hybrid Single-Particle Lagrangian Integrated Trajectory Model (HYSPLIT) to estimate the temporal variation of the ventilation coefficient and Layer Height of Mixture ( MLH), which indicated a significant influence of local sources, during the night in autumn, the mean ventilation coefficient exceeded 4500 ms-1, suggesting effective dispersion of pollutants. Furthermore, the pre-monsoon season exhibited an observable impact of solar radiation (SR) on photochemical O3 formation. In winter, high concentrations of O3 were observed, probably due to local biomass burning.

Keywords: Nitrogen oxides; ozone; Large field; seasonality; trend; ventilation coefficient