And for some, it feels like allergy "season" never ended this year. In her own practice, Neeta Ogden, MD, an adult and pediatric allergist in New York City and Englewood, N.J., has seen patients with more severe seasonal allergies than ever before. "What's been interesting about this past year was the continuity of symptoms," she says. "There didn't seem to be a real let up." Warm winter led to early and intense spring allergies, she says, which persisted into summer and now fall. "Even as an allergist I found it difficult," says Dr. Ogden. "You feel your patients will get some kind of relief, but there was a chronic-ness to their symptoms which was a real frustration point for all of us." Among autumn's allergy arsenal is ragweed pollen , the primary allergy trigger for the fall season. Ragweed plants, which belong to the sunflower family, tend to bloom from mid-August to October. But dry weather and drought during summer extended its season. Since 1995, climate change has extended ragweed season by almost a full month, according to a study in the Proceedings of the National Academy of Sciences . Mold and grass also trigger allergy symptoms during the fall . Mold actually poses a year-round problem for allergy sufferers, because it grows both outdoors and indoors. In August, the allergist who for the past 15 years has recorded the Gottlieb Allergy Count, the official allergy count for the Midwest, saw the highest mold count of his tenure. The Worst