Investigation of the Air Pollution Event in Beijing-Tianjin-Hebei Region in December 2016 Using WRF-Chem

Figure 3

Surface weather chart from Hong Kong Observatory (a). For large-scale background field simulated in D01 (b), contour interval of sea-level pressure is 2 hPa, and black arrows show wind field 10 m above the surface; times are 18:00 on 16 December, 00:00 on 18 December, and 00:00 on 19 December 2016.

(a)

(b)