The graphs show 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). Vertical lines correspond to target or threshold values set by the EU legislation.
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Avoid disposing any waste on the streets, in nature, and especially not in the gutter. This rubbish can end up in the water treatment system and overcharge the decontamination process. Take advantage of city waste baskets. They are everywhere and that's what they are for.
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