Is 45 degrees harmful to people?

Medical research shows that environmental temperature is closely related to human physiological activities. The most comfortable environmental temperature of human body is between 20℃ and 28℃, and the ideal temperature is 15℃ ~ 20℃. In this environment, people have a strong memory and high work efficiency. The incidence rate is higher when the temperature is 4℃ ~ 10℃, and it is easy to produce chilblain when it is lower than 4℃, and the incidence rate is higher. When the ambient temperature is higher than 28 degrees, people will feel uncomfortable; No matter how high the temperature is, it will easily lead to irritability, heatstroke and mental disorders; Above 30℃, the human body will partially start sweat glands to discharge body heat, and at 35℃, all sweat glands will be put into work; The temperature is higher than 34℃, accompanied by frequent heat waves, which can also cause a series of diseases, especially the incidence of cardiovascular and cerebrovascular diseases and respiratory diseases, and the mortality rate is obviously increased. High temperature above 37℃ is harmful to human protein. If the temperature of human body reaches above 40℃, the life center will be directly threatened.

This is because the human body directs normal activities through the central nervous system of the brain. The heat generated in the body is basically equal to the heat emitted, and the body temperature is generally kept between 36.5℃ and 37℃. In addition to breathing and defecation, the heat dissipation of the human body is mainly distributed through the skin layer. Due to the appearance of high temperature weather, the heat balance of human body is destroyed, leading to heatstroke and other diseases. Therefore, in meteorology, when the highest temperature in a day is ≥32℃, it is designated as high temperature weather. There are two kinds of hot weather: hot weather and hot and humid weather. The highest temperature on that day is ≥35℃ and the relative humidity is below 60%, which is called hot and hot weather. When the highest temperature of the day is ≥32℃ but less than 35℃ and the relative humidity is above 60%, it is called muggy weather. Under such weather conditions, the sweat of the human body can't be discharged from the skin, and the heat is difficult to dissipate, which makes me feel very uncomfortable. This is the direct impact of natural warming on the human body.

Natural warming has an indirect impact on human health. First, the warming of nature provides better breeding conditions for mosquitoes and flies, provides a better environment for pathogens to spread, and is conducive to the prevalence of infectious diseases. Second, high temperature can accelerate the photochemical reaction rate, thus increasing the concentration of harmful gases in the atmosphere and further endangering human health. The "heat island effect" of the city will also make the temperature of each part of the city different, but present a closed high temperature center. In these high-temperature areas, the air density is low and the air pressure is low, which is easy to produce cyclone updraft, so that all kinds of waste gas and chemical harmful gases around it can continuously supplement the high-temperature areas. Under these harmful effects, residents in high temperature areas are prone to digestive system or nervous system diseases. In addition, the number of respiratory diseases such as bronchitis, emphysema, asthma, sinusitis and pharyngitis has also increased.

Therefore, in the hot summer, we should pay special attention to the high temperature and high humidity forecast issued by the meteorological department in order to do a good job in high temperature prevention. We should also make full use of high-tech means to create a comfortable environment to meet the needs of human health.