Research Article
Spatial Distribution and Temporal Trend of Tropospheric NO2 over the Wanjiang City Belt of China
Figure 7
Total of OMI-retrieved vertical column densities (×1015 molec./cm2) of NO2 in Anhui. (a) Total of NO2 vertical column densities from 2005 to 2010. (b) Total of NO2 vertical column densities from 2011 to 2016. (c) Difference in the total of NO2 vertical column densities between the two periods. The positive values indicate an increasing trend of NO2 vertical column densities from 2005 to 2016, and vice versa.
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