Solar ultraviolet radiation on the ground level of Isfahan

Nearly every one and every thing is likely to be exposed to sunlight and the ultraviolet (UV) for various period of time, during their lives. UV radiation affects health(1). It causes photoaging (2), eye disease (3-6), sunburn (7), tanning (8), immune suppression (9-11), DNA mutation (11, 12) and cancers.(13, 14), The probability of occurrence of these diseases depends on the received doses by the target organ. The amount of solar ultraviolet radiation at the earth's surface depends on the incoming solar energy and the transmission properties of the atmosphere. Ultraviolet radiation (UVR) is strongly absorbed by ozone in the spectral range of 200-310nm, while the attenuation is increasingly weaker at higher wavelength.(15), Moreover the UV field is affected by complex absorption and scattering processes in the atmosphere, in which both astronomic and atmospheric factors (solar zenith angle, earth distance, cloud cover, turbidity, albedo, pressure, temperature, humidity, ...) play an important role. Some of these factors, in turn, may have a time behavior characterized by trends or long period fluctuations. An analysis of the observed spectral and integrated irradiances to derive a geographic pattern of solar UV fluxes in terms of different parameters could be helpful in assessing UV doses of different population groups. The UVR doses of Isfahan residence were never measured. However, it is necessary for assessing the risk of UV related health effects, especially during growing the age and childhood, as well as decisions on preventive actions.