The filter above the air conditioner will be attached to a lot of house dust mites, if the air conditioner starts, the dust mites will move with the air, stimulating the patient’s nasal mucosa to produce a metamorphic reaction, nasal congestion, sneezing, runny nose, can be diagnosed as allergic rhinitis. It is recommended that patients must regularly clean the filters on top of the air conditioner, and at the same time can do a good job of protection. It is best to apply Tess pollen blocker on the surface of the nasal mucosa, which can effectively avoid contact between dust mites and the patient’s nasal mucosa, and the nose needs to be cleaned daily to clean out bacteria and dust, which can reduce the patient’s clinical symptoms, or consider spraying saline, and if necessary, adding montelukast sodium tablets for anti-allergy.