Why are Bangkok residents warned to stay out of the midday sun?

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Bangkok residents are warned to stay out of the midday sun because the heat index is in the “Danger” range and raises the risk of heatstroke
Bangkok residents are being told to avoid unnecessary time outdoors between 11am and 3pm because the city’s heat index has climbed to 51.9°C, placing the capital in the “Danger” zone. The heat index reflects how hot conditions feel to the human body by combining heat and humidity, and high humidity reduces the body’s ability to cool itself through perspiration. Authorities say this increases the risk of heat-related illnesses, including heatstroke.
The heat index in Bangkok reached 51.9°C and falls under “Danger”
The heat index climbed to 51.9°C, which authorities classify as “Danger” for readings from 42°C to 51.9°C. The next category, “Very Dangerous,” begins at 52°C and is when people are advised to avoid all outdoor activity. With Bangkok just below that threshold, officials urged residents to limit exposure during the hottest period.
Humidity makes the heat feel worse and increases illness risk
The heat index combines heat and humidity to measure how hot conditions feel to the human body. When humidity is high, the body’s cooling through perspiration becomes less effective, which increases the risk of heat-related illnesses. This is why the warning is focused on staying out of the midday sun rather than only the recorded air temperature.
Residents are told to avoid outdoor activities between 11am and 3pm
Authorities placed Bangkok in the “Danger” zone and urged people to avoid unnecessary outdoor activities during the 11am to 3pm window. The warning is tied to the heightened risk of heatstroke during the hottest part of the day. Officials also stressed that people should watch for symptoms that can signal worsening heat illness.
Specific warning signs and emergency steps were highlighted
Officials listed warning signs of heat-related illness including fatigue, dizziness, skin rashes, cramps, and unusually red or swollen skin. They said these symptoms can progress quickly to life-threatening heatstroke if not treated. For monitoring, residents can check real-time conditions through the AIR BKK mobile application or its LINE account, and anyone suffering from heat-related illness should call the 1669 emergency hotline immediately.

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Why are Bangkok residents warned to stay out of the midday sun?

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