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Next is the grass pollen season, which begins in mid-May and ends in July. Grass pollen allergy is more common than tree or weed pollen allergy. Grass pollen grains are relatively large and tend to cause a blocked nose and sore eyes more than irritate the lungs.
Weed Pollen Allergies. Late summer and fall is the season for weed allergies, with pollen levels usually peaking in mid-September. Pollen counts for weeds are highest in the morning, usually between 5 a.m. and 10 a.m. Weed pollens are the most prolific allergens of all. A single ragweed plant, for instance, can produce a billion pollen grains in a season.