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  2. Ultraviolet index - Wikipedia

    en.wikipedia.org/wiki/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-producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public.

  3. UV index: Levels explained and how to protect yourself - AOL

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  4. Photocatalyst activity indicator ink - Wikipedia

    en.wikipedia.org/wiki/Photocatalyst_activity...

    Photocatalyst activity indicator ink (paii) is a substance used to identify the presence of an underlying heterogeneous photocatalyst and to measure its activity. Such inks render visible the activity of photocatalytic coatings applied to various "self-cleaning" products.

  5. Dangerous heat continues to bake areas of the West from ...

    www.aol.com/weather/dangerous-heat-continues...

    In the heart of the Southwest, locations like Las Vegas and Phoenix are forecast to have max ultraviolet (UV) index levels categorized as extreme for much of this week, ranging between 11 and 12.

  6. Electromagnetic radiation and health - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_radiation...

    The Sun's UV output is divided into UV-A and UV-B: solar UV-A flux is 100 times that of UV-B, but the erythema response is 1,000 times higher for UV-B. [citation needed] This exposure can increase at higher altitudes and when reflected by snow, ice, or sand. The UV-B flux is 2–4 times greater during the middle 4–6 hours of the day, and is ...

  7. Get the Boydton, VA local weather forecast by the hour and the next 10 days.

  8. Spectrophotometry - Wikipedia

    en.wikipedia.org/wiki/Spectrophotometry

    This method requires a spectrophotometer capable of measuring in the UV region with quartz cuvettes. [3]: 135 Ultraviolet-visible (UV-vis) spectroscopy involves energy levels that excite electronic transitions. Absorption of UV-vis light excites molecules that are in ground-states to their excited-states. [5]

  9. Health effects of sunlight exposure - Wikipedia

    en.wikipedia.org/wiki/Health_effects_of_sunlight...

    Over the past several years, levels of ultraviolet radiation have been tracked at over 30 sites across North America as part of the United States Department of Agriculture's UVB Monitoring and Research Program at Colorado State University. The first map at right shows levels of UVB radiation in June 2008, expressed in Vitamin D Equivalents. [26]

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