Spatial Distribution and Temporal Trend of Tropospheric NO₂ over the Wanjiang City Belt of China

Figure 4

Comparison of OMI-retrieved tropospheric NO₂ columns and surface in situ concentrations for eight WCB cities: (a) Hefei; (b) Wuhu; (c) Ma’anshan; (d) Chuzhou; (e) Chizhou; (f) Anqing; (g) Tongling; (h) Xuancheng.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)