The extended pollen season in Washington DC poses significant risks for allergy sufferers, with symptoms such as sneezing, nasal congestion, itchy eyes, sinus pressure, and asthma exacerbation. Tree pollen, particularly from oak, is the most problematic allergen in spring, while grass pollen peaks in early summer and ragweed dominates the fall. Mold spores also contribute to year-round allergy symptoms, especially in humid conditions. The urban heat island effect, which raises downtown temperatures by 2–5°F, further exacerbates pollen production and exposure, making allergy management critical for residents.