What weed pollen causes the most common fall allergies?

Ragweed pollen is the primary culprit behind the most common fall Allergies. It typically begins to pollinate in late summer and can continue through the first frost, releasing large amounts of pollen into the air. This pollen can travel long distances, making it a widespread allergen during the fall season. People sensitive to ragweed may experience symptoms such as sneezing, nasal congestion, and itchy eyes.