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FILE - Yellow and green pollen cover the leaves of a Japanese Red Maple in north Raleigh, N.C. on Monday, April 5, 2010. There are three main types of pollen that cause seasonal allergies. Earlier in the spring, tree pollen is the main culprit. After that grasses pollinate, followed by weeds in the late summer and early fall. (Shawn Rocco/The News & Observer via AP)
An oak tree with new leaf growth also shows pollen and a drop of water hanging among the branches at a park in Richardson, Texas, Thursday, March 21, 2024. The 2024 allergy season in the U.S. is starting sooner than experts expected. There are three main types of pollen that cause seasonal allergies. Earlier in the spring, tree pollen is the main culprit. After that grasses pollinate, followed by weeds in the late summer and early fall. (AP Photo/Tony Gutierrez)
The branches of an oak tree are stained with a green tint from pollen at park in Richardson, Texas, Thursday, March 21, 2024. The 2024 allergy season in the U.S. is starting sooner than experts expected. There are three main types of pollen that cause seasonal allergies. Earlier in the spring, tree pollen is the main culprit. After that grasses pollinate, followed by weeds in the late summer and early fall. (AP Photo/Tony Gutierrez)