In early spring, when many overwintering insects begin to emerge, they need a readily available source of nourishment to ...

Prior to the European colonization of North America, Indigenous Americans harvested the wood of redbud trees to construct ...

This time of year, red maple birch and willow ... There are other trees as well, of course. But not all pollen is an allergen. For example, the large grains of pine pollen, which you’ll start ...

For trees and flowers ... eight cities in California saw large increases in their allergy rankings as a result of a "grass and weed pollen explosion," which the foundation says was intensified ...

With tree pollen high across the UK this week, millions are bracing for the annual spike in hay fever symptoms. The Met Office has issued a red warning across many regions of the UK this week.

With tree pollen high across the UK this week, millions are bracing for the annual spike in hay fever symptoms. The Met Office has issued a red warning across many regions of the UK this week.

That's how challenging it can be for scientists to distinguish the tiny powdery pollen grains produced by fir, spruce and pine trees ... and potentially bringing big relief to allergy sufferers.