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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The plastic bags you use but for a few minutes can last for as long as 15 to 1,000 years in the environment. Don't get a new plastic bag each time you go shopping. Get a funky re-useable or cotton bag instead and say 'no thanks' to plastic or paper bags.
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