The graph is based on the 93.15 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 out of the 10 years
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.
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