We live in the atmosphere, and we are always affected by weather changes. The influence of meteorological elements on human body is realized through skin, respiratory system and sensory system. The receptors in different parts of the human body can be stimulated by different meteorological factors, and the skin and mucosa are mainly stimulated by temperature, humidity, precipitation, wind, atmospheric acidity, solar radiation and fog. The respiratory system is mainly stimulated by temperature, humidity, wind, air pressure, aerosol, atmospheric electricity and all chemicals in the atmosphere; Sensory organs, including eyes, nose and ears, can accept light (such as visible light), air pressure, fog, atmospheric electricity, smell and other stimuli. ? Different meteorological factors act on different parts of the human body, which can cause different physiological function changes.

When air temperature acts on the skin, it can cause thermoregulation reaction by acting on the human nervous system, so that human blood vessels can contract or relax to keep body temperature constant, and air temperature can also affect human endocrine function; The effect of sunlight on eyes can affect human pituitary gland, regulate antidiuretic urea and control human urine volume; The combined effect of air temperature and humidity on respiratory system can make human respiratory mucosa dry, reduce elasticity and reduce the function of excreting foreign bodies; Temperature and humidity can also affect the growth of bacteria and viruses in the respiratory tract. When the humidity is high, Gram-negative bacteria are easy to reproduce, and when the humidity is low, Gram-positive bacteria and influenza virus are easy to reproduce. Wind acts on human skin, regulates human body temperature, determines human convection heat dissipation, and affects human sweating heat dissipation rate; When the temperature is higher than the temperature of human skin, the wind always produces heat dissipation, and when the temperature is higher than the temperature of human skin, the wind plays two relative roles of heating and heat dissipation.

The aggravation of air pollution increases positive ions and acts on the respiratory tract, weakening the ciliary activity of the trachea, causing dry throat and headache; The increase of atmospheric acidity can shrink human tracheal mucosa cells and cause tracheal inflammation. In a word, weather changes will cause a series of physiological reactions and affect people's health. ?

1one night in June, 980, 40,000 people suddenly fell ill in Leningrad, the former Soviet Union. There was neither plague nor collective poisoning. How can so many people get sick at the same time? It turned out that the weather was abnormal that day, and the temperature suddenly rose from -44℃ to +6℃ within a few hours. It is this drastic weather change that makes so many people sick at the same time. ? Atali, a French doctor of medicine, pointed out that in a year, the transitional season is the most obvious time when the human body is affected by climate. In these seasons, hot air blows in many parts of the world, which doubles the positive ions contained in the air. Experiments show that when positive ions are in the majority, it will have adverse effects on human body. After many years of observation in Atali, the experience is that the climate on 15 every month is the most harmful to people. The new moon day (the first day of each month) is the least harmful. From the date of the harvest of the moon in the middle of winter, the incidence rate increased obviously every three months.