The Global Solar UV index (UVI), an information tool that describes the level of solar UVR at the Earth’s surface, was developed by WHO, the United Nations Environment Programme (UNEP), the World Meteorological Organization (WMO) and the International Commission on Non-Ionizing Radiation Protection (ICNIRP).

The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn -producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public.

The wavelength of UV radiation (UVR) lies in the range of 100–400 nm, and is further subdivided into UVA (315–400 nm), UVB (280–315 nm), and UVC (100–280 nm). The UV component of terrestrial radiation from the midday sun comprises about 95% UVA and 5% UVB; UVC and most of UVB are removed from extraterrestrial radiation by stratospheric ozone.

2022年6月20日 · What is the UV index? The UVI is a measure of the level of UV radiation. The values of the index range from zero upward - the higher the UVI, the greater the potential for damage to the skin and eye, and the less time it takes for harm to occur. The UVI is an important vehicle to alert people about the need to use sun protection.

UV Index Today provides national and local UV index forecasts for 40,000+ cities in the United States. Our forecasts include the real-time UV index, the hourly UV index, and the UV Index forecast for the next five days. Our forecasts are built using data provided by NOAA.

Optical radiation is radiant energy within a broad region of the electromagnetic spectrum that includes ultraviolet (UV), visible (light) and infrared radiation. Ultraviolet radiation (UVR) is characterized by wavelengths between 10 and 400 nm—bordered on the one side by x rays and on the other by visible light (Fig. 1).

As part of a broader project to assess major risk factors to health, the burden of disease resulting from exposure to ultraviolet (UV) radiation was assessed. The estimates presented are population-weighted average daily ambient UVR level (in J/m2) for the years 1997–2003 for selected countries.

2024年9月16日 · Data source and definition: Ultraviolet radiation (UVR), expressed as the average daily ambient ultraviolet radiation level (in J/m 2), the World Health Organization; Cardiovascular disease (CVD) incidence rate, the number of newly diagnosed cases per 100,000 in 2019, the Institute for Health Metrics and Evaluation; Ageing indexed with life ...

The global solar ultraviolet index (UVI) describes the level of solar ultraviolet radiation (UVR) at the Earth's surface and ranges from 1 to 11+. The higher the UVI, the greater the potential for damage to the skin and eyes, and the shorter the time before skin damage (manifested as skin reddening, or erythema ).

2021年12月21日 · Broad-spectrum UVR includes wavelengths of light ranging from 100 to 400 nm. UVR is divided into wavelength ranges identified as UVA (315 to 400 nm), UVB (280 to 315 nm), and UVC (100 to 280 nm). Of the solar UV energy reaching the …