Research Article
Investigation of the Air Pollution Event in Beijing-Tianjin-Hebei Region in December 2016 Using WRF-Chem
Figure 4
Simulated and observed hourly relative humidity and temperature 2 m above the surface (RH2, unit: %; T2, unit: °C), surface PM2.5, NO2, and SO2 concentration (unit: µg/m3) during from 04:00 on December 18 to 16:00 on December 19. The blue star indicates observed, and the red solid line indicates simulated. These four columns indicate (a) Beijing site, (b) Tianjin site, (c) Shijiazhuang site, and (d) Baoding site from left to right, respectively.
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