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 mg/m3). The vertical line corresponds to the limit value set by the EU legislation.
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Each year on World Environment Day, schools and environmental organisations worldwide organise clean up operations. Join one! In addition to enriching the landscape of your neighbourhood, you will learn more about the animals and plants that live nearby.
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