Bars represent average annual concentrations over a limited number of monitoring stations along busy roads in major European cities (Vienna, Bruxelles, Prague, Helsinki, Paris, Berlin, Athens, Krakow, Bratislava, Stockholm and London), error bars represent the highest annual concentration measured at one single monitoring station
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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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