(3) in wind modeWind is one of the important factors in the process of spreading and transform the air contaminants in the atmosphere. There are two main wind direction during the year:+ From January to June: wind direction control is Southern with a frequency of 20-40%, wind East (20%) and wind (37%).+ From July to December: wind direction control is Southwest. During this period, the wind velocity has the highest value. The time average speed of 2-3 m/s, the highest value recorded was in 1972 is 36 m/sec. (Hydro-meteorological Stations South, 1998).Frequency of the wind direction and wind speed (%) recorded at Tan Son Nhat stations are presented in the table below:
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