In Figure 8 , left panel, the SO 2 column density in the East United States shows a decreasing trend from 2005 to 2012, consistent with EPA Air Quality System surface measurements, National Emission Inventories emissions, and previous SO 2 column (Krotkov et al., 2016 ) and top‐down studies (Fioletov et al., 2017 ).
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SO<sub>2</sub> Emission Estimates Using OMI SO<sub>2</sub> Retrievals for 2005-2017.
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