T_h, or temperature-humidity index, is a measure that combines air temperature and humidity to assess how hot it feels to the human body. It is often used in weather reports to help people understand the impact of heat and moisture on comfort levels. Higher values indicate a greater discomfort due to heat and humidity. The T_h index is particularly important in fields like meteorology and public health, as it can influence decisions regarding outdoor activities and safety. Understanding T_h can help individuals take precautions during extreme weather conditions, such as staying hydrated and avoiding strenuous activities.