Climate Change is Worsening Seasonal Allergies

Hazy summer day, southern Indiana. Photo: Jeffrey St. Clair.

As the seasons shift into spring and summer, flowers bloom, trees turn green, and the days grow longer and sunnier. However, for many, this time also marks the start of allergy season in the United States, which can begin as early as February in warmer regions and persist through early summer. Tree pollen usually kicks things off in early spring, followed by grass pollen in late spring and summer. Later in the year, fall allergies—primarily triggered by weed pollen...