Officials warned that symptoms such as fatigue, dizziness, nausea or fainting should not be ignored, and said anyone experiencing them should seek medical attention immediately.
Public advised to avoid midday outdoor activity
Authorities recommended avoiding outdoor activity between 11am and 3pm, drinking water regularly, and resting in well-ventilated places or cooling areas.
They added that prolonged exposure to extreme heat could lead to heat stress and increase the risk of heat stroke, which is considered a medical emergency.
Although PM2.5 levels in many parts of Bangkok remained at moderate to good levels and did not exceed the standard limit, officials stressed that heat had now become the dominant health risk during this period.
Residents were advised to keep monitoring both air-quality and heat updates closely and to contact emergency medical services immediately if needed.