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