Pollen allergy is an important cause of seasonal allergic rhinitis, allergic asthma, and allergic conjunctivitis. Many patients with allergic diseases caused by dust mite allergy often experience significant exacerbation during the pollen season. For patients with allergic rhinitis, in the pollen season there are often: itchy eyes, itchy external ear canal, itchy soft palate and other symptoms, accompanied by obvious nasal congestion, sneezing, runny nose, tears. Pollen allergy is seasonal and the concentration of pollen is positively correlated with the severity of symptoms. Spring pollen is often concentrated in March to May, there are: cypress, French sycamore, ash, birch, poplar, willow, elm, fir. Summer and fall pollen is often concentrated in August-September, generally early August, the beginning of autumn began to appear, the concentration gradually increased, continued to October after the Fourth of July the concentration gradually decreased. Mainly: Artemisia pollen, grass, ragweed pollen, alewives and so on. Artemisia plants belong to the Asteraceae family of plants, common contains Aster, Cangzhu, Fenghuang, grass saffron, artichoke, artichoke, dandelion, Cangzhu, Artemisia Inchneri, Artemisia annua, Ai, Niu Laoci, Pelargonium, wild chrysanthemum, chrysanthemum, Asclepiadum, Sunflower, Lettuce, Chrysanthemum, dahlia flower. Symptoms of pollen allergy sufferers in summer and fall are much more severe than in spring. Prevention of pollen season: 1. When it is windy on sunny days, the concentration of pollen is high, so reduce going out. 2.Reduce going out during pollen season and avoid strenuous exercise. 3, spring or summer and fall pollen allergy children are not suitable for field trips. 4.Wear masks, closed glasses, and clean your face, glasses, and nasal passages when you return to the house from outdoors. 5. Take a bath before going to bed to remove pollen from other parts of the body. 6, close the windows in the car, close the doors and windows indoors. If you have the condition, you can install air purifier. 7, pollen season, do not hang the clothes outside, to prevent pollen adhesion.