
Cool spring delays pollen release, but New England allergy season stays high into summer
A cool May delayed the release of tree pollen across New England, but grass pollen is now surging and keeping allergy levels high. Pollen has been medium or high for 13 of the last 15 days, and May typically blends grass and tree pollen in Greater Boston. Experts warn that pollen levels will remain high through much of the summer as grass, ragweed, and mold rise, with Boston’s allergy season lengthened by more than two weeks since 1970.












