What are the hazards of hot weather?

The influence of high temperature weather on human health is mainly heatstroke and death caused by cardiovascular and cerebrovascular diseases. Under the action of excessive ambient temperature, the thermoregulation mechanism temporarily fails, leading to heat accumulation in the body and heatstroke. According to the symptoms and degree of heatstroke, it can be divided into: heatstroke is the mildest manifestation of heatstroke and the most common; Thermal radiation refers to long-term work in a high temperature environment, which leads to vasodilation and congestion of the lower limbs, leading to fainting; Heatstroke is caused by long-term exposure, which leads to perspiration dysfunction. For people suffering from hypertension, cardiovascular and cerebrovascular diseases, in the environment of high temperature, humidity, no wind and low pressure, human perspiration is inhibited, the stored heat in the body increases, and the oxygen consumption of myocardium increases, which makes the cardiovascular system in a state of tension. The sweltering heat can also lead to vasodilation and increased blood viscosity, which is prone to symptoms such as cerebral hemorrhage, cerebral infarction and myocardial infarction, and may lead to death in severe cases.

According to the investigation of cardiovascular and cerebrovascular diseases in Beijing, it is found that hot and humid weather is a dangerous weather that leads to ischemic brain death. It's sultry in summer, and it's also prone to colds (Xia Han), diarrhea, skin allergies and other diseases. The reason is that in the high temperature environment, human metabolism is vigorous, energy consumption is large, and sultry heat often makes people lack sleep and lose appetite, which leads to the decline of human immunity. At this time, if you don't use air conditioners or electric fans to relieve summer heat, the human body will be in a low temperature environment for a long time, and its adaptability and resistance will decrease, and germs and viruses will take advantage of it and easily cause upper respiratory tract infections (colds); In addition, in the high temperature and high humidity environment, bacteria, viruses and other microorganisms multiply in large quantities, and food is easy to deteriorate, which will cause indigestion, acute gastroenteritis, dysentery, diarrhea and other diseases after eating; When people come home from the outdoor high temperature environment, they are used to turning on the air conditioner or directly blowing it with an electric fan and eating some iced food. This kind of cold and hot immediately took effect and immediately began to have diarrhea. Hot weather and poor perspiration can easily lead to skin allergies, especially for children under 10, mainly papular urticaria, eczema and contact dermatitis. The reason is that children have poor adaptability to hot and humid weather and are allergic to mosquito bites, pollen and dust. In addition, indigestion, indigestion and parasites can also cause diseases.

I remember that from July/KLOC-0 to July 2, 2004, at least 39 people in Guangzhou died of diseases induced by hot weather. Most of them are elderly people with chronic diseases. And the hot weather in Europe in 2003. In Paris, France, the average temperature in August is 24℃ all the year round, but the average temperature in the same period in 2003 was as high as 37℃ or above. Many people died of diseases caused by high temperature. Reports from hospitals and funeral institutions show that during the week from August 4th to 10, 3,230 people died, while the average weekly death toll in France was only 2,300. In many cities in Italy, the average daily temperature has set a record for many years. In July 2003, the highest daily temperature in Rome reached 36.9℃. The daily maximum temperature in many cities in the northern region is even close to 40%. Due to the hot weather, during the three days from August 9th to 1 1, more than 30 people died of heatstroke in Turin and Milan alone, most of them were elderly people in their sixties and seventies.