Analysis of SO<sub>2</sub> Pollution Changes of Beijing-Tianjin-Hebei Region over China Based on OMI Observations from 2006 to 2017

<div>Annual mean curve of SO<sub>2</sub> column concentration of each city in the BTH region, 2006–2017.</div>

Advances in Meteorology

Figure 15: Analysis of SO<sub>2</sub> Pollution Changes of Beijing-Tianjin-Hebei Region over China Based on OMI Observations from 2006 to 2017 