Symptoms and specification as adopted by the ICP Forest (International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests (ICP Forests, 2010)).
Link to this table.

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Affected part Symptom/sign Code Symptom/sign specification Code
Leaves/needles Partly or totally devoured/missing 01 Holes or partly devoured/missing 31
Notches (leaf/needle margins affected) 32
Totally devoured/missing 33
Skeletonized 34
Mined
Premature falling 36
Light green to yellow discoloration 02 Overall 37
red to brown discoloration (incl. necrosis) 03 Flecking, spots 38
Bronzing 04 marginal 39
Other color 05 Banding 40
Interveinal 41
Tip, apical 42
partial 43
Along veins 44