If you like to exercise outdoors but struggle with pollen allergies, you might want to exercise in the morning. In a new study presented at the annual meeting of the American College of Allergy, Asthma and Immunology, researchers at Emory University measured pollen at three sites in Atlanta in March 2021. They determined that pollen levels were lowest in the early mornings and were highest in the afternoons and evenings. In addition to morning workouts, it might be a good idea to leave your shoes and clothes outside to avoid bringing any pollen inside your house, as well as showering to get the pollen out of your hair.