Allergenic pollen refers to tiny particles released by plants, such as trees, grasses, and weeds, during their reproductive cycle. These pollen grains can trigger allergic reactions in sensitive individuals, leading to symptoms like sneezing, runny nose, and itchy eyes. Common sources of allergenic pollen include ragweed, birch trees, and grass species. The amount of allergenic pollen in the air varies by season and location. For example, spring often sees high levels of tree pollen, while fall is typically associated with increased ragweed pollen. Monitoring pollen counts can help individuals manage their allergies more effectively.