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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.
However, most photocatalyst commercial products use only a thin layer of titania (e.g. ca. 15 nm thick in self-cleaning glass) [24] and ambient UV levels are often low (e.g. for a sunny day in the UK the UVA irradiance is only ca. 4 mW/cm 2).
Extreme UV and X-rays are produced (left of wavelength range) but comprise very small amounts of the Sun's total output power (area under the curve). Although the solar corona is a source of extreme ultraviolet and X-ray radiation, these rays make up only a very small amount of the power output of the Sun (see spectrum at right).
UV detectors are sensitive to most fires, including hydrocarbons, metals, sulfur, hydrogen, hydrazine, and ammonia. Arc welding, electrical arcs, lightning, X-rays used in nondestructive metal testing equipment (though this is highly unlikely), and radioactive materials can produce levels that will activate a UV detection system. The presence ...
Blood levels of folate, a nutrient vital for fetal development, can be degraded by UV radiation, [59] raising concerns about sun exposure for pregnant women. [60] Lifespan and fertility can be adversely affected for individuals born during peaks of the 11-year solar cycle , possibly because of UV-related folate deficiency during gestation.
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Highest monthly total (UK national average) [11] 266 hours UK (national average) May 2020 Highest monthly total (England) [2] 383.9 hours Eastbourne, Sussex: July 1911 Highest monthly total (Northern Ireland) [2] 298 hours Mount Stewart, County Down: June 1940 Highest monthly total (Scotland) [2] 329.1 hours Tiree, Argyll & Bute: May 1975
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