The graphs are based on the annual mean concentration values; 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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Did you know that most of oil pollution in our oceans is the result of human activity on land and not tanker spills? If you notice oil leaking from your car, fix it right away! Never dispose of used oil into a storm drain.
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