The graph shows the percentage frequency distribution of stations (on the y-axis) in the EU Member States versus the various concentration classes (on the x-axis, in µg/m3). The vertical line corresponds to the limit value set by the EU legislation.
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Decrease your CO2 emissions and keep your electricity bills low by making the most of natural light. Think about choosing pale-coloured walls, ceilings and floors, as well as mirrors, to reflect the daylight.
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