The results were based on automatic, hourly measurements of tropospheric ozone concentrations registered in immission station of Voivodeship Inspectorates of Environmental Protection, located in Szczecin, at Andrzejewskiego Street. It was found that during the study period covering the 2005–2007, the greatest average concentrations of ozone was stated in the spring season, the smallest in autumn and winter. In terms of week measurements the immission level in weekend days was dominant over the rest of the week, marking the strongest in the spring season. In the course of twenty four hours of ozone, especially during spring and summer, a clear increase of concentrations beginning in the morning, with a maximum falling in the hour from 15.00 to 18.00 (UTC time) occurred.

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