Achoo! Spring allergy season may be longer, stronger

Posted: 4/1/2013

This year's spring allergy season is nothing to sniff at: The season may be longer and stronger, allergists say.

Blooming trees have been releasing pollen into the air, triggering allergic reactions in some people. The start of tree pollination varies across the country, and cold spells in certain regions cause pollen levels to fluctuate.

Increased mean temperatures from climate change affect tree pollination, says Richard Weber, president of the American College of Allergy, Asthma and Immunology. "We are seeing trees not only pollinate earlier but also produce more pollen," he says. Read more.