Ragweed pollen is the source for many common fall allergy symptoms. It grows throughout the United States and releases pollen from August to November. Typically, ragweed pollen counts are highest in mid-September. 3
Mold is also a typical trigger for autumn allergies. Molds are fungi (not the ones you eat in salads) that thrive in moist, damp environments. The rotting leaves of fall provide an excellent home for mold growth, and to the detriment of allergy sufferers, release spores into the air to reproduce. These tiny spores are often the culprit for the nasal congestion, runny noses, sneezing, and watery, itchy eyes you see in allergy sufferers.4
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Both spring and fall have their share of troublesome allergens. Which season is worse really comes down to what you're allergic to and just how allergic you are.