Table 2.

UTCI range and corresponding thermal stress level.

UTCI (°C) Range	Stress Category	Protective Measures
+9 to +26	No thermal stress	Physiological thermoregulation is sufficient to maintain thermal comfort
+26 to +32	Moderate heat stress	Drinking > 0.35 L/h of fluids is necessary
+32 to +38	Strong heat stress	Drinking > 0.35 L/h of fluids is necessary. Staying in shaded places is recommended. Periodically, a reduction in physical activity is recommended
+38 to +46	Very strong heat stress	Temporary use of air-conditioned rooms or staying or staying in shaded places is periodically necessary. Drinking > 0.5 L/h is necessary. Reduce physical activity
>46	Extreme heat stress	Temporary body cooling is periodically necessary. Drinking > 0.5 L/h is necessary. Avoid physical activity