TY - JOUR ID - 1855 TI - Modeling of sulfur dioxide emissions in Ahvaz City, southwest of Iran during 2013 JO - Caspian Journal of Environmental Sciences JA - CJES LA - en SN - 1735-3033 AU - Goudarzi, Gh. AU - Geravandi, S. AU - Ahmadi Angali, K. AU - Neisi, A.K. AU - Yari, A.R. AU - Dobaradaran, S. AU - Ghalani, B. AU - Hashemzadeh, B. AU - Mohammadi, M.J. AD - Ahvaz Jundishapur University AD - Islamic Azad University of Tehran AD - Qom University AD - Bushehr University AD - Orientation System Efficiency Manager of NIDC Ahvaz AD - Urmia University Y1 - 2016 PY - 2016 VL - 14 IS - 3 SP - 205 EP - 213 KW - Sulfur dioxide KW - Emissions KW - Time series analysis KW - Iran DO - N2 - Sulfur dioxide has two important sources in the atmosphere and this is why most of scientists believe in a geographic split in the globe. Power plants, major emitter of SO2, are located in north hemisphere such as in Russia, China, Canada and the USA. In south hemisphere, phytoplankton produces a massive amount of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS). Then these types of reduced products dissociate in the atmosphere and convert into SO2. It is a colorless gas which is released from burning coal, high sulfur coal and diesel fuel. The sulfur dioxide emissions from transportation systems, steel, oil and other industries are major concerns of air pollution in Ahvaz city, Iran. The main objective of this study was to determine the behavior of data over the time in a specific statistical model framework and compare through intended one to implement the Box-Jenkins method to make time series models in Ahvaz (located in Southwestern Iran), during 2013. Data of sulfur dioxide from four monitoring stations were collected at the first step and processed by Excel software; finally, the model of sulfur dioxide dispersion were evaluated. Time series analysis showed that air pollutants were associated with one step delay of sulfur dioxide and two steps delay of moving average. The finding of this study showed that the average concentration of sulfur dioxide in winter was higher than in summer. According to the results of this study, distribution of sulfur dioxide data has a correlated structure over the time; therefore the time series model is an appropriate model to explain the behavior of sulfur dioxide over the time. UR - https://cjes.guilan.ac.ir/article_1855.html L1 - https://cjes.guilan.ac.ir/article_1855_f9a5f84dbba9fc17067d0204da49f7bb.pdf ER -