Outdoor Triggers
Airborne pollens and molds commonly cause symptoms of asthma during spring and fall. These include:
Pollens: Pollens are thin, powdery granules that play an important role in the fertilization of plants. Weather conditions have a significant impact on the amount of pollen in the environment. Pollen season will vary depending on where you live but generally lasts from February to October. Pollen from a variety of grasses, weeds, and trees may cause symptoms of allergy.
Molds: There are many airborne molds in the outdoor environment, but they don’t have a specific season, unlike pollens.