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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Instead of using a fresh piece of paper for rough work, turn over a used copy and write on the other side. Use products made of recycled paper. Remember! Every ton of recycled paper saves 17 trees compared to paper made from virgin materials.
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