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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(TV, DVD player, stereo system) into a single multi-socket electrical bar. When not in use, simply switch off the bar and save on the electrical consumption by as much as 10 %. Appliances left on standby still use quite a lot of electricity.
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