SULFUR DIOXIDE 



HARDWOODS 



Tolerant 



Intermediate 



Sensitive 



Hedge maple (Acer campestre) 



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Red maple (Acer rubra) 



• 







Sugar maple (Acer saccharum) 



• 







Mountain maple (Acer spicatum) 



• 







Birch (Betula sp.) 







• 



European hornbeam (Carpinus betulus) 



• 







Catalpa (Catalpa sp.) 







• 



White dogwood (Cornus florida) 



• 







European beech (Fagus sylvatica) 



• 







Green ash (Fraxinus pennsylvanica) 



• 







Maidenhair tree (Gingko biloba) 



• 







English holly (Ilex aquifolium) 



• 







English walnut (Juglans regia) 







• 



Tulip tree (Litriodendron tulipfera) 



• 







Apple (Malus sp.) 







• 



Texas mulberry (Morus microphylla) 







• 



Black gum (Nyssa sylvatica) 



• 







Sourwood (Oxydendron arboreum) 



• 







American planetree (Platanus occidentalis) 



• 







Oriental planetree (Platanus orientalis) 



• 







Balsam poplar (Populus balsamifera) 





• 





Eastern Cottonwood (Populus deltoides) 



• 







Bigtooth aspen (Populus grandidentata) 





• 





Lombardy poplar (Populus nigra 'Italica') 







• 



Quaking aspen (Populus tremuloides) 







• 



Pear (Pyrus communis) 







• 



English oak (Quercus robur) 



• 







Red oak (Quercus rubra) 



• 







Black locust (Robinia pseudocacia) 



• 







Willow (Salix sp.) 







• 



European mountain ash (Sorbus aucuparia) 







• 



American elm (Ulmus americana) 







• 



HYDROGEN FLUORIDE 



SOFTWOODS 



Tolerant 



Intermediate 



Sensitive 



Juniper (Juniperus sp.) 



• 







Western larch (Larix occidentalis) 







• 



White spruce (Picea glauca) 



• 







Colorado spruce (Picea pungens) 









Lodgepole pine (Pinus contorta (latifolia) 









Dwarf mugo pine (Pinus mugo mughus) 









Ponderosa pine (Pinus ponderosa) 









Eastern white pine (Pinus strobus) 









Scotch pine (Pinus sylvestris) 









Loblolly pine (Pinus taeda) 









Douglas fir (Pseudotsuga menziesii) 









Japanese yew (Taxus cuspidata) 





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Arborvitae (Thuja sp.) 





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