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