الفهرس 
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Abstract
THIS STUDY INCLUDES:
1-ANALYSIS OF THE RESULT AT DIFFERENT MONTHS,SEASONS AND OVER THE WHOLE PERIOD ON THE BASIS OF HOURLY,AND MONTHLY AVERAGES
2-ACOMPARISON among the different turbidity coefficients in cairo,aswan and martuc,reflecting the characteristics of three
3-the effect of some weather parameters relative humidity(RH)in fraction.