Fig. 4: Time series of meteorological conditions and NO3− regional sources in Shanghai. | npj Clean Air

Fig. 4: Time series of meteorological conditions and NO3− regional sources in Shanghai.

From: Nitrate-driven extreme winter PM2.5 pollution in Shanghai, China

Fig. 4

a Observed wind, relative humidity (RH), and precipitation (PRE). b Comparison of observed and simulated NO3− concentrations in Shanghai. c Simulated regional contributions to NO3− in Shanghai (SH Shanghai, JSZJ Jiangsu and Zhejiang, AH Anhui, NCP North China Plain, bdy boundary sources). Red shading indicates pollution days (PM2.5 > 35 μg m−3).

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