Pollen count for the region Leiden
beech
poplar
plantain
oak
mugwort
ragweed
hazel
grasses
birch
willow
rye
rumex
alder
beech
poplar
oak
grasses
birch
willow
plantain
rye
rumex
mugwort
ragweed
hazel
alder
oak
grasses
birch
beech
poplar
plantain
willow
rye
rumex
mugwort
ragweed
hazel
alder
oak
birch
grasses
beech
poplar
plantain
willow
rye
rumex
mugwort
ragweed
hazel
alder
oak
birch
grasses
beech
poplar
plantain
willow
rye
rumex
mugwort
ragweed
hazel
alder
oak
birch
grasses
beech
poplar
plantain
willow
rye
rumex
mugwort
ragweed
hazel
alder
oak
birch
plantain
grasses
rumex
beech
poplar
willow
rye
mugwort
ragweed
hazel
alder
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