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 ng/m3). The vertical line corresponds to the target value set by the EU legislation.
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Be careful when buying for your garden. People are one of the main introducers of invasive species, especially flora. Many of the invasive species have been introduced for ornamental purposes. Do put an extra effort in finding out whether the plant you want is native to your environment.
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