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Allergy season will likely continue to worsen for many individuals with tree, grass or weed allergies. According to the Proceedings of the National Academy of Sciences of the United States of ...

Tree pollen usually arrives first in April. Grass pollen picks up in May and June and weed pollen is most prevalent in July and August. Dr. Rachna Shah tracks the pollen levels in the Chicago area.

The state Department of Environmental Quality, which measures the amount of pollen in the air, says numbers have been rising for tree pollen already, and grass and weed pollen are coming.