Indexed trends in air quality

Figure Created 12 Jan 2011 Published 12 Jan 2011 Last modified 13 Jun 2013
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"Annual mean concentrations of air pollutants in urban areas" Indexed trend in annual mean urban air quality over the period 1997-2008 (reference year 1997). All urban and suburban background stations operational (that is at least reporting over 9 years with a yearly coverage of at least 274 days) during the period 1997-2008 are included. A general, Europe-wide averaged picture is shown, with a bias towards regions with high station density.

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