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