PM2.5 and human respiratory diseases are more closely related, the smaller the diameter into the respiratory system, the deeper the location of the short-term exposure can induce lung diseases, such as asthma, acute bronchitis, respiratory infections, long-term exposure will lead to a decline in lung function, chronic bronchitis and so on. Haze harm to children: 1, acute respiratory infections Children’s respiratory tract is very delicate, fragile, infants and young children have no nasal hair, nasal cavity than adults, short, curvature is not as big as adults, the face of harmful substances, neither the nasal hair such as a filtering barrier, but also because of the straight-through the airway, so that the airflow is unobstructed, so more sensitive to adverse weather. 2, chronic respiratory disease aggravation For children suffering from bronchial asthma, chronic bronchitis and other diseases, hazy weather can make the condition of acute attacks or acute exacerbation; studies have shown that the increase in the concentration of PM2.5 is significantly related to the increase in the number of patients with respiratory diseases, the increase in the PM2.5 can be caused by the increase in the rate of children’s asthma emergency room visits. 3, emotional instability The hazy days will also affect the baby’s mood, because the weather is cloudy all day, the sun is dim and cloudy, the baby’s body in the pineal gland will secrete more pineal gland hormone, so that the concentration of thyroxine and adrenaline is relatively low. Thyroxine, adrenaline and other hormones that evoke cellular work, once reduced, the cells will be “lazy”, become extremely inactive, the baby will also appear listless. 4, an increase in infectious diseases The sun’s ultraviolet radiation can promote the body’s synthesis of vitamin D, long-term hazy weather when the weakening of ultraviolet radiation can directly lead to an increase in the chances of babies suffering from pediatric rickets. In addition, ultraviolet light is the main weapon in nature to kill part of the atmosphere microorganisms such as bacteria, viruses and so on. Haze weather leads to the weakening of ultraviolet radiation in the near-surface layer, which enhances the activity of infectious-pathogenic bacteria in the air and increases the number of infectious diseases. Children’s respiratory protection in hazy weather: 1, minimize going out: Although a mask can prevent some dust from entering the nasal cavity, can play a certain protective role. But the defense is limited, so the most direct way to avoid damage to children is to reduce going out. 2, less open window ventilation: should choose the midday sunshine is more abundant, less pollutants when the window ventilation, time should not be too long. Can be in their own balconies, terraces, indoor green plants, such as green, green, green crown leaf plants such as tiger orchids to purify indoor air. Plants can only fall on the leaves of the particles to stay, and can not be like a vacuum cleaner, absorbing dust in the air; particles with the air flow through the plant will be settled on its surface, by the branch and leaf retention and adsorption, the formation of stagnant dust effect; but this retention and adsorption is temporary. 3, wear a mask Primary school students go out in the morning and evening, you can wear a cotton mask to reduce the incidence of respiratory diseases; tell the children to walk away from the road as far as possible, because the peak commuting and evening large cars into the city during these hours, the highest concentration of pollutants; tell the children not to do too strenuous exercise, to avoid breathing sharply when the pollutants will be more inhaled. 4, light diet: eat less stimulating food, eat more fresh vegetables and fruits, you can supplement a variety of vitamins and inorganic salts, regular work and rest, avoid overwork, drink more water, eat more tofu, milk and other foods. You can eat more nourishing Yin moistening lung pear, lily, loquat, lozenges and so on. 5, do a good job of personal hygiene: in order to avoid children infected with various types of viruses, parents should first change their coats and pants after going out and coming home, wash their faces and hands, and isolate the viruses outdoors. When someone in the family has a cold or other respiratory disease, do not or reduce contact with children. Myopic children, dusty weather should not wear contact lenses, because the dust into the eyes, it is easy to cause sand and contact lenses ask the friction, triggering eye diseases. 6, appropriate warmth: at home, to note closed doors, windows, indoor temperature to maintain 18 ℃ -22 ℃ is appropriate, to avoid excessive temperature differences. To maintain the humidity of the children’s room at 45% -55%, drink more water.