Fig. 1. The mean results of the model simulations: (a), (d), and (g) show scatterplots and linear regressions of observed (OBS) and simulated (SIM) for mean temperature (T), relative humidity (RH), and wind speed (WS) in 367 cities for the Nudging and Base simulations during the pollution episode from 11 to 19 January 2018, respectively. The model results for the Nudging case ((b), (e), and (h)); ((c), (f), and (i) are for the Base case) with observations overlaid (circle) for T, RH, and WS over China during the pollution episode from 11 to 19 January 2018. Colored circles denote locations of ground measurement sites. The black triangles in (b) denote the locations of the Xianghe and Taizhou air quality monitoring supersites. (b) shows the model domain.