Patient haze allergy, is due to the haze contains a large number of suspended particles, particles contain a very large number of fine dust, dust haze, as well as some of the chemical gases of atmospheric pollution, after entering the airway, there will be varying degrees of allergic symptoms, the airway manifestation of persistent, irritating dry cough, can be accompanied by tightness of the chest, shortness of breath, shortness of breath, wheezing symptoms, manifested as bronchial asthma symptoms. It can also be accompanied by nose itching, sneezing, runny nose, manifested as allergic rhinitis, and in severe cases, respiratory distress, which can lead to hypoxemia combined with hypercapnia, causing respiratory distress and even coma.