In this paper, by using MODIS and OMI satellites sensor data, the HYSPLIT meteorological model and ground-based measurements by the Meteorological Organization and the Air Quality Control Center of Tehran data, a dusty day has been investigated. Aerosol optical depth shows a measure of solid or liquid suspended particles in the atmosphere. The MODIS sensor, which is located on Aqua and Terra satellites, records the amount aerosol optical depth at 550 nm for July 6, 2009 above 2. Also, the aerosol Index measured with OMI sensor is above 4 for the day. The Angstrom exponent shows a measure of atmospheric particle size that the measurement of MODIS sensor for the day is close to zero, indicating coarse particles. On the dusty day, the concentration of PM10 is higher than 800 μg / cm3 and the horizontal visibility below 2 km. The HYSPLIT model, aerosol optical depth maps and aerosol indexes show that dust is coming from the Iraq.

Keywords: Aerosol Index, Aerosol Optical Depth, HYSPLIT model, Angstrom Exponent, MODIS.

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