How many degrees does the temperature rise need heatstroke prevention?

The two factors of heatstroke are relative temperature and air temperature, so heatstroke prevention can't just look at air temperature, the main factor is air temperature.

People's outdoor activities for a long time will lead to dysfunction of thermoregulation and heatstroke. The occurrence of heatstroke is not only related to temperature, but also related to humidity, wind speed, labor intensity, high temperature environment, exposure time, physical strength, nutritional status, water and salt supply and so on. The inducing factors are complex, but the main factor is temperature.

According to the meteorological characteristics, the microclimate of heatstroke site can be divided into two categories: one is dry and hot environment, which is characterized by high temperature, strong radiant heat and low humidity. The ambient temperature is generally 5- 15℃ higher than that outside, and the relative humidity is often below 40%. The other is a hot and humid environment with high temperature and humidity, but the radiation heat is not strong. Because when the temperature is 35-39℃, 2/3 of the body's residual heat is excreted by sweat evaporation, and if the surrounding environment is humid, sweat is not easy to evaporate.

According to experimental research, the meteorological conditions leading to heatstroke are: relative humidity 85%, temperature 30-365438 0℃; Relative humidity 50%, temperature 38℃; The relative humidity is 30% and the temperature is 40℃.

At present, the forecast of heatstroke index made by Guangzhou Meteorological Observatory is used to remind people who work or exercise outdoors to pay attention to heatstroke prevention and avoid heatstroke when meteorological conditions are prone to heatstroke.

Description of heatstroke index grade:

The range of the grade index indicates the measures to be taken.

class A

Grade ⅱ 10-20 is prone to mild heatstroke, so avoid direct sunlight on the head.

Grade ⅲ 2 1-40 is prone to moderate heatstroke, so try to stay in a cool and ventilated place, drink plenty of water and take a bath.

Grade 4 4 1-60 is prone to severe heatstroke. Try to avoid going out and take measures to prevent heatstroke and cool down.

Level 5 > easy to get heatstroke, avoid going out. Measures must be taken to prevent heatstroke and stop labor and exercise.

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