The crowds filter in with the arrival of tree pollen.

Different people are sensitive to different grass and tree pollens, she says.

For instance, you may be sensitive to tree pollen.

It takes a while to get used to the tree pollen around here.

Amongst the tree pollen the mixed oak forest was able to keep its share of 30%.

The tree pollen disappeared from the record by 1650, and the statues stopped being made around that time.

But this year, abetted by cool, wet weather, tree pollen emerged much later than usual.

Winter and spring, you are probably allergic to tree pollens.

As forests were cleared for agriculture and industry, almost every type of tree pollen declined.

Typically, if you suffer from hay fever in the spring, you're probably allergic to tree pollens.