The UV index is not the warm sensation of sunlight on bare skin

The UV index, a measure of the sun's ultraviolet radiation, is not directly related to the warmth or sensation of sunlight on the skin. While the warmth is caused by infrared radiation, the UV index is a separate measure that only considers the amount of UV radiation that reaches the Earth's surface. The UV index is used to inform people about the potential health risks of sun exposure, such as increased risk of skin cancer and cataracts.