In the renovation process part of the population will lead to pneumonia, general renovation will appear chemical pollutants, such as phenol, sulfur dioxide, ammonia, and even nitrous oxide, carbon monoxide, etc., these relatively irritating odors will be inhaled by the human body to the airway, and stimulation induced mucous membranes within the airway congestion, edema, and even secretion exudate. If the airway is more sensitive patients can also appear high reaction state, resulting in bronchial smooth muscle contraction, spasm so that the airway becomes narrow, then there will be allergic pneumonitis, manifested as wheezing, shortness of breath, chest tightness, coughing, coughing sputum. Clinically, it is generally necessary to avoid re-exposure to the renovated space, avoid allergens and give anti-allergy treatment, the symptoms can be relieved.