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Station pairs from capital cities were preferred, but when not available the next largest city for which data were available was chosen
Number of monitoring stations in brackets Western Europe: Austria (103), Denmark (32), France (204), Germany (109), United Kingdom (30)
Trend analyses are based on time series 1985-2002 from each monitoring station having at least 3 years data in the period 1995-2002 and at least 5 years data in all
Number of monitoring stations in brackets Western Europe: Austria (2), Germany (5), Denmark (23), Ireland (1)
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
Concentrations are the median of the annual average concentrations at each monitoring station
For references, please go to https://www.eea.europa.eu/data-and-maps/find/global or scan the QR code.
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