Annual average mean NO2 and PM10 concentrations at traffic monitoring stations

Bars represent average annual concentrations over a limited number of monitoring stations along busy roads in major European cities (Vienna, Prague, Paris, Berlin, Athens, Krakow, Bratislava, Stockholm and London NOX, and Prague, Copenhagen, Berlin, Reykjavik, Rome, Bratislava, Stockholm and London PM10), error bars represent the highest annual concentration measured at one single monitoring station