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 …

Get the most accurate, real-time UV index for any city in the United States. Check the live hourly UV forecast, understand the UV scale with our detailed chart, and get essential sun safety tips …

Ultraviolet index Average UV at noon 1996-2002 (European Space Agency) The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn …

Jul 16, 2025 · Ultraviolet (UV) radiation is a form of non-ionizing radiation that is emitted by the sun and artificial sources, such as tanning beds. While it has some benefits for people, …

Dec 18, 2025 · The ozone layer effectively blocks almost all solar radiation of wavelengths less than 290 nm from reaching Earth’s surface, including certain types of ultraviolet (UV) and other …

Mar 20, 2025 · While we need some exposure to sunlight to help our bodies make vitamin D, too much UV is dangerous. Almost half the daytime total of UV radiation is received between 10 …

UV rays are strongest in areas close to the equator. Because the sun is directly over the equator, UV rays only travel a short distance through the atmosphere to reach these areas.

Jul 24, 2025 · Ultraviolet (UV) radiation covers the wavelength range of 100–400 nm, which is a higher frequency and lower wavelength than visible light. UV radiation comes naturally from …

In cases of long exposure to the Sun's light without protection, a person's risk of skin cancer and other dangerous cellular afflictions greatly increases. The eyes should also be protected from …

Apr 1, 2023 · Ultraviolet light or UV is electromagnetic radiation in the wavelength range of 10 to 400 nanometers (nm), which is between x-rays and visible light. Because it is largely invisible …