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