Fig. 10: Time series and chemical composition of particulate matter in Beijing and Hyytiälä.
From: Understanding atmospheric processes: insights from the comparison between Beijing and Hyytiälä

a Time evolution of daily PM concentrations in Beijing (red) and Hyytiälä (blue). The chemical compositions of non-refractory PM, including organics, sulfate, nitrate, ammonium, chloride and black carbon are also illustrated in (b) Beijing and (c) Hyytiälä. Daily mean datasets from 2018 to 2022 were used.