The Impact of Meteorological Parameters on SO2 Pollutant Accumulation over Urmia City

In this research, the impact of meteorological parameters on SO2 accumulation between 2009 to 2015 years over Urmia City was investigated. Due to the polluted days and no remarkable effects relating to increasing industrial activities and transport services as well as the number of lorries and cars around the Urmia City, the parameter of meteorology plays a very crucial role in this issue. Therefore, some meteorological parameters considered were wind speed, wind direction, nebulosity, and temperature and SO2 pollutant as air pollution index. This study revealed that SO2 accumulation over Urmia City happens when the wind speed is 2-3 m/s, prevailing wind direction is Eastern, South-Eastern, nebulosity is none or low and the temperature is between -5 to °C. February month is the most polluted month in year and the highest pollution occurs at 15-20 h.