As the U.S. welcomes spring, it also means the arrival of allergy season, which affects millions of people.
High pollen levels can lead to a variety of symptoms including sneezing, runny nose, itchy and watery eyes, hives and coughing — and Americans may have to deal with them for much longer than in past years.
Typical allergy seasons are getting longer and more intense in North America because of climate change, research shows.
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