Pollen count for the region Hertfordshire
oak
birch
ash
plantain
nettle
grasses
mugwort
hazel
elm
yew
willow
rumex
poplar
alder
oak
birch
ash
plantain
nettle
grasses
mugwort
hazel
elm
yew
willow
rumex
poplar
alder
oak
grasses
birch
ash
plantain
nettle
mugwort
hazel
elm
yew
willow
rumex
poplar
alder
oak
grasses
birch
ash
plantain
nettle
mugwort
hazel
elm
yew
willow
rumex
poplar
alder
oak
grasses
birch
ash
plantain
nettle
mugwort
hazel
elm
yew
willow
rumex
poplar
alder
oak
grasses
birch
ash
plantain
nettle
mugwort
hazel
elm
yew
willow
rumex
poplar
alder
oak
grasses
birch
ash
plantain
nettle
mugwort
hazel
elm
yew
willow
rumex
poplar
alder
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