SUN INDEX COMPARE CITIES SKIN

An Australian study in 2008 found that some commercial sunbeds emitted up to six times more UVA than summer sun. Solariums emitted primarily UVA since the 1980s (99% UVA and 1% UVB), with their UVB output equivalent to a high UV Index of 12, similar to the midday summer sun in the tropics. Solariums are another source of UV radiation, which are now banned for commercial use in all states and territories of Australia. īack to top Artificial UV radiation sources Īpproximately 60% of the day’s total carcinogenic radiation is received between 10am and 2pm (local standard time). Reflective surfaces can scatter UV radiation, with snow (85-90%) and water (particularly white foam: 30%) reflecting the most UV radiation. However, cloud cover does not attenuate solar UV intensity to the same degree as infrared intensity (sensation of heat), so overexposure on cloudy, relatively cooler days should also be avoided. The ozone layer and to a lesser extent heavy, non-scattered cloud cover can reduce UV radiation. Solar UV intensity increases with sun elevation (incident angle of sunlight), altitude and lower latitude. UV-reflective surfaces (such as snow and water).Altitude (UV increases by about 4% per every 300 m).The amount of cloud cover (on average, clouds reduce clear sky UV by 30%).Distance from the equator (the closer to the equator, the higher the UV radiation level).The height of the sun (the higher the sun is in the sky, the higher the UV radiation level).UV radiation levels vary throughout the year and throughout the country according to: Table 1 shows the average monthly UV Index across Australia. The Earth's orbit also brings countries in the southern hemisphere (Australia included) closer to the sun in summertime than countries in the northern hemisphere during summer.

SUN INDEX COMPARE CITIES SKIN

As our senses cannot detect UV, overexposure may be damaging our skin and eyes without our knowledge.Īustralia experiences some of the highest levels of UV radiation in the world because we are close to the equator and have many clear, blue-sky days.

UV radiation is not part of the visible spectrum of light, nor is it thermal radiation - unlike sunlight it cannot be seen, nor can it be felt like the sun’s warmth.

Sun index compare cities