Study sites of silver birch (Betula pendula Roth, white dots), common hazel
(Corylus avellana L., yellow dots) and horse chestnut (Aesculus hippocastanum L., red
dots) in the greater area of Munich, Germany. Small black dots within white dots
symbolize the sites where O3 and NO2 passive sampling was performed in 2010.
Background: CORINE Land Cover 2000