In 2011-2017, through various emission reduction measures, the total emission of main pollutants in the exhaust gas in Shanxi Province has been well controlled, and the emissions of sulfur dioxide, nitrogen oxide and smoke (dust) have been significantly reduced. According to the annual environmental statistical data from 2011 to 2017, the change trend and causes of the main pollutants in the exhaust gas are analyzed, and the improvement measures are put forward.<br>
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