Figure

Trends in NO2 annual mean (top) and NO2 hourly concentrations (bottom) in μg/m3, 2002–2011, per station type

Figure Created 02 Oct 2013 Published 05 Nov 2013 Last modified 05 Nov 2013

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The graphs are based on annual mean concentration trends (top) and the trends in percentile 99.78 of NO2 hourly values (bottom); they present the range of concentration changes per year (in μg/m3) per station type (urban, traffic, rural, and other — mostly industrial). The trends are calculated based on the officially reported data by the EU Member States with a minimum data coverage of 75 % of valid data per year for at least 8 years out of the 10-year period. The diagram indicates the lowest and highest trends, the means and the lower and upper quartiles, per station type. The lower quartile splits the lowest 25 % of the data and the upper quartile splits the highest 25 % of the data.