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Table 1 Evaluation criteria for sampling sites

From: Pesticides and pesticide-related products in ambient air in Germany

Factor   Code in Number of cases passive air sampler
Regression tree
Landscape classification Alpenvorland (AVL) a 5
in regression tree: Nordostdeutsches Tiefland (NOTL) b 13
"Naturraum " Nordwestdeutsches Tiefland (NWTL) c 11
  Östliches Mittelgebirge (OMG) d 4
  Südwestdeutsches Mittelgebirge / Stufenland (SWMGS) e 8
  Westliches Mittelgebirge (WMG) f 8
Biogeographical region Atlantical a 11
"BioGeo " Continental b 38
Risk of wind erosion 0.0–1.0 a 28
"Erosion3 " 1.5–2.0 b 7
  2.5–3.0 c 12
  3.5–5.0 d 2
Protected area No a  
"SchutzGebJN " Yes b  
Agricultural intensity Low (Ratio 0–20%) a 10
"LwIntK " Medium (Ratio 20–50%) b 13
Percentage of arable farming in a 4 km2 area around the sampling site High (Ratio > 50%) c 26
Distance to the nearest possible source Close range: a few m to 100 m a 16
"DistanzE " Middle range: 100–1000 m b 21
  Far distance: over 1000 m c 12
Organic production No a 39
"BioJN " Yes (including 2 National Parks) b 10