The graphs are based on the 90.4 percentile of daily mean concentration values corresponding to the 36th highest daily mean; they present the range of concentrations at all station types (in μg/m3) officially reported by the EU Member States and how the concentrations relate to the limit value set by EU legislation (marked by the red line).
The diagram indicates the lowest and highest observations, the means and the lower and upper quartiles. 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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Appreciate wildlife, but be sure to watch wild animals from a distance and avoid feeding them. Remember, the scent you leave when you touch a nest or a lair may scare the parents off for good. Instead of touching, try to find out more about them and maybe even discover how you can contribute to their protection.
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