It’s allergy season and that means sneezing, coughing and itchy eyes for many. If you’ve wondered if your allergies are getting worse, you’re not alone. New research shows that pollen season is getting longer and more intense. But why? Lew Ziska, associate professor at Columbia University and a co-author of a new study on pollen, joins The Excerpt to share the science behind an intensifying allergy season.

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