High tree pollen

Tree  pollen has  remained high over the past 24hrs, those who are tree pollen allergic will need to take care 

Tree pollen remains at a moderate level

Grass pollen remains low but tree pollen remains at a moderate level. Those who are tree pollen allergic will need to take care. 

Grass pollen low, tree pollen moderate

Grass Pollen remains low but t here is still significant amounts of tree pollen around, those allergic to tree pollen will need to take care