As soon as the fall and winter seasons, the serious haze is back, especially for asthma patients need to pay attention to prevent. Haze is known as the health of the “invisible killer”. Now the haze in the atmosphere, in fact, is PM10, PM2.5, SO2, NO2, carbon monoxide and ozone and other mixed hazardous substances, will have a direct or indirect harm to human health, will affect the cardiovascular system, respiratory system, nervous system, endocrine system. Studies have shown that increased levels of air pollutants on hazy days significantly increase the incidence of chronic respiratory diseases and can induce acute exacerbation of asthma and chronic obstructive pulmonary disease (COPD). We all feel that in this kind of headache weather, the most obvious thing is that it is easy to have a cold, cough, and more will aggravate the symptoms of asthma patients. So, what should be done to prevent asthma attacks, avoid fluctuating symptoms and protect the airways on hazy days? 1, when the haze is serious, reduce the time of outside activities, go out and wear a mask: the morning is often a day when the haze is more serious, and many people like to carry out morning exercise, but in the hazy days this is very undesirable. Although exercise is good for the body, because exercise will inhale extra air, if the air quality is bad, you will inhale more harmful substances to increase the body’s risk of respiratory diseases. Especially for those who already suffer from asthma, it will aggravate the symptoms of asthma or trigger an asthma attack. So don’t exercise outdoors on hazy days, and minimize the time you go out. For have to go out of the office workers, it is recommended to wear masks, you can choose pm2.5 protective masks, some masks come with ventilation fan, you can increase the degree of comfort. Should also pay attention to the cleaning of the mask, disposable masks used to throw away in a timely manner, can be repeatedly used masks should also pay attention to cleaning, disinfection, regular replacement. 2, asthma patients adhere to the regular drug therapy: although bad air will induce respiratory diseases, but if asthma patients can adhere to the regular use of asthma medication (such as inhaled hormones, Xinbike, Schulich, etc.) treatment, then the airway will have a certain protective effect, reduce the bad air or environmental sensitizers on the airway stimulation. In addition, elderly patients have more co-morbidities, such as cardiovascular and cerebrovascular diseases, which may induce other diseases if asthma is not well controlled. Therefore, when encountering hazy days, it is more important to take medication according to the doctor’s instructions, on time and in accordance with the amount of medication, in order to ensure that the disease is relatively stable. 3, it is recommended that the use of home air purifiers appropriate window ventilation: hazy days do pay attention to close the windows and doors, but the air circulation at home will also cause the accumulation of indoor bacteria, so it is also necessary to open the windows to ventilate appropriately. You can choose to take turns to open the windows of the room without people to ventilate the indoor air, and at the same time open the air purifier at home, which helps the air clean. 4, asthma patients diet note: in the haze weather to drink more water, eat more fresh fruits and vegetables, the diet should be lighter. You can eat more food that moisturizes the lungs and relieves cough (such as green tea, rooibos tea, silver ear and snow pear, lily of the valley, etc.), these foods have the function of moisturizing the lungs, which is helpful for lung cleaning. In addition, a balanced diet, avoid overwork, in order to improve their immunity. 5, only asthma patients know the pain: the change of season means more risk factors, in life, especially pay attention to keep warm, away from allergens, in addition to the use of inhalation medication on time to maintain, but also to carry relief medicine.