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