UV intensity refers to the strength or amount of ultraviolet (UV) radiation present in a particular environment. UV radiation is a type of electromagnetic radiation with shorter wavelengths than visible light, and it is divided into three categories based on wavelength: UVA, UVB, and UVC.

UV intensity is typically measured in terms of power per unit area and is expressed in units such as watts per square meter (W/m²). The intensity of UV radiation can vary depending on factors such as the time of day, geographic location, altitude, atmospheric conditions, and the presence of reflective surfaces.

Exposure to high levels of UV radiation, especially UVB and UVC, can have harmful effects on living organisms, including humans. UV radiation is known to cause sunburn, premature aging of the skin, and an increased risk of skin cancer. It is important to protect oneself from excessive UV exposure by using sunscreen, wearing protective clothing, and avoiding prolonged exposure to direct sunlight.