The graphs are based on the 8-hourly mean concentration values; they present the range of concentrations at all station types (in mg/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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Think first before buying a Sport Utility Vehicle (SUV).
In addition to being very expensive to run, SUVs are very fuel inefficient. They emit twice as much carbon monoxide, hydrocarbons and nitrogen dioxide as an average car. These chemicals contribute to air pollution as well as global warming!
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