Aerosol Optical Thickness at Tabuk City, SA
Khadeejeh M. Hamasha, Hala M. Abu Mostafa, Lalitha T. Alexander

Abstract
There is a need to recognize air pollution levels by particles, especially in the countries where data are scarce due to the absence of routine monitoring of ambient air quality. This study aims at studying the air quality in the city of Tabuk through the measurement and analysis of the aerosol optical thickness (AOT) for three different wavelength (870nm, 550nm, and 660nm).AOT were measured using sun photometer at 870nm wavelength and calculated from satellite maps at 550nm and 660nm.this measurements were conducted during July 2012. The calculations of the angstrom parameter a using the data of AOT at 550nm wavelength for each day show values ranging between 2.21 and 6.39 which indicate that the atmosphere of Tabuk city has air pollutants in the range of fine particles. The average visibility attributed to aerosol at the City Center site dominated by urban scale and regional scale was ranging from 11km to 53km.

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