A study of trend and seasonality of tropospheric NO2 over Iran by using 14 years of OMI data acquisition

Author

Department of physics, Zanjan branch, Islamic Azad University, Zanjan, Iran

Abstract

Results of a study on tropospheric NO2 over Iran for a 14 years period have been reported. Monthly averages of tropospheric NO2 concentrations recorded by OMI from Oct 2004 to Mar 2018 have been used. A model including a linear and sinusoidal term is applied to study trend and seasonal behavior of NO2 concentrations. Original 0.125 ×0.125 degree data of OMI have been averaged to get 1 ×1 degree resolution to analyze trends. Trend results with 95% confidence level have been reported. In 27 centers of provinces in Iran, real trends have been detected. By using seasonal analysis, mostly polluted months have been determined for these cities. 2 cities experience most pollution in spring, 3 in summer, 2 in autumn and 24 cities in winter. Pollution source type classification shows 24 urban and 3 soil emission cases for the studied cities. Source type determination was impossible in 4 cities by criteria used in this paper.

Keywords


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