Imagine trying to tell identical twins apart just by looking at their fingerprints. That's how challenging it can be for scientists to distinguish the tiny powdery pollen grains produced by fir, ...

A 2021 study concluded pollen season in North America is 20 days longer over a 30-year period from 1990 to 2018.

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Tree pollen declines across Washington, DC in June, but grass pollen, ragweed, mosquitoes, ticks, and fleas remain active ...

It’s that time of year again when bright yellow-green clouds float through the air, turning the shallow waters of Lake Tahoe ...