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Figure

Annual changes in concentrations of PM10, O3 and NO2 in the period 2001–2010

Figure Created 03 Oct 2013 Published 05 Nov 2013 Last modified 21 Feb 2014

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The data presented were derived from a consistent set of stations in all years. Statistically significant trends (level of significance 0.1) are calculated by applying the Mann-Kendall test. Increasing concentrations are indicated with red dots and decreasing concentrations with green dots, when statistically significant. The applied method is described in de Leeuw, 2012.