Trends in O3 concentrations per station type

Notes:
The graph is based on the 93.2 percentile of the maximum daily 8-hour O₃ concentration trends; it presents the range of concentration changes per year (in μg/m³) per station type. The trends are calculated based on the officially reported data by the EU Member States with a minimum data coverage of 75% of valid data per year, for at least 8 years of the 10-year period.

The diagram indicates the lowest and highest trends, the means and the lower and upper quartiles, per station type. The lower quartile splits the lowest 25% of the data, and the upper quartile splits the highest 25% of the data.