The UV Index (UVR or UV RN) is an international standard measure that indicates the strength of ultraviolet (UV) radiation from the sun reaching the Earth's surface. It is expressed on a scale from 0 (low) to 11+ (extreme), with higher values representing stronger UV radiation and a greater risk of skin and eye damage
. The UV Index helps people understand the potential harm from sun exposure and guides them on necessary protective measures such as wearing sunscreen, protective clothing, and avoiding the sun during peak hours (usually 11 a.m. to 3 p.m.)
. UV radiation consists mainly of UVA and UVB rays that reach the surface, while UVC rays are mostly absorbed by the ozone layer and do not reach us
. UVA rays penetrate deeply and contribute to long-term skin damage, while UVB rays cause sunburn and play a major role in skin cancer development
. The UV Index varies by location, time of day, season, cloud cover, altitude, and atmospheric conditions. It is updated daily by meteorological and environmental agencies to provide current forecasts for specific regions
. In summary, the UV Index is a crucial tool for assessing sun exposure risk and protecting skin and eyes from harmful ultraviolet radiation.
