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

Spring and tree pollens peak at different times as the year progresses. But they are both spreading northward across the U.S. as May begins. Tree pollen is about to get worse in cities like New York, ...

Spring means beautiful flowers, fragrant lilacs – and lots of tree pollen coating cars and setting off sneezing, wheezing and headaches. As an allergist and immunologist at the University of Colorado ...

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

Spring isn’t the only time that more than 80 million Americans have to worry about seasonal allergies. The fall comes with its own pesky pollen and mold that can result in clogged noses and itchy eyes ...