What are the Types of Ultra-Violet Radiation?
Ultra-Violet Radiation (UV) may be classified as near UV (380-200 nm wavelength), far or vacuum UV (200-10 nm) and extreme UV (1-31nm).
On the basis of its effect on human health and environment, UV radiation is often sub classified into -
- UV- A (long wave)
- UV-B (medium wave)
- UV-C (short wave)
Which type of Ultra-Violet Radiation is most harmful?
UV-C is the most harmful, but along with most of UV-B, it gets filtered by the ozone layer of earth's atmosphere and most of it fails to reach earth. UV-A and UV-B that reach the earth contribute to the health hazard that result from over exposure to the sun. Almost 99% of the ultraviolet radiation that reaches the earth is UV-A.
References for Ultra-Violet Radiation - Harmful Effects And Benefits
- Stratosphere: UV Index - (http://www.cpc.ncep.noaa.gov/products/stratosphere/uv_index/index.html)
- UV Index Information - (http://www.cpc.ncep.noaa.gov/products/stratosphere/uv_index/uv_information.shtml)
- UV Index: Annual Time Series - (http://www.cpc.ncep.noaa.gov/products/stratosphere/uv_index/uv_annual.shtml)