OXIDES OF NITROGEN 



SOFTWOODS 



Tolerant 



Intermediate 



Sensitive 



European larch (Larix decidua) 





• 





White spruce (Picea glauca) 









Colorado spruce (Picea pungens) 









Dwarf mugo pine (Pinus mugo mughus) 









Austrian pine (Pinus nigra) 









Eastern white pine (Pinus strobus) 









OXIDES OF NITROGEN 



HARDWOODS 



Tolerant 



Intermediate 



Sensitive 



Japanese maple (Acer palmatum) 









Norway maple (Acer platanoides) 









European hornbeam (Carpinus betulus) 









European beech (Fagus sylvatica) 









Maidenhair tree (Gingko biloba) 









Apple (Malus sp.) 









Pear (Pyrus communis) 









Black locust (Robinia pseudoacacia) 









European elder (Sambucus nigra) 









Little leaf linden (Tilia cordata) 









Large leaf linden (Tilia grandiflora) 









PEROXYACETYL NITRATE (PAN) 









SOFTWOODS 



Tolerant 



Intermediate 



Sensitive 



European larch (Larix decidua) 









Japanese larch (Larix leptolepis) 









White spruce (Picea glauca) 









Colorado spruce (Picea pungens) 









Jack pine (Pinus banksiana) 









Austrian pine (Pinus nigra) 









Pitch pine (Pinus rigida) 









Eastern white pine (Pinus strobus) 









Douglas fir (Pseudotsuga menziesii) 









Eastern hemlock (Tsuga canadensis) 









PEROXYACETYL NITRATE (PAN) 



HARDWOODS 



Tolerant 



Intermediate 



Sensitive 



Sugar maple (Acer saccharum) 



• 







Tulip tree (Liriodendron tulipfera) 







• 



Little leaf linden (Tilia cordata) 







• 



