Fig. 23: Locations of measurement stations and air mass transport sectors for SMEAR II and BUCT/AHL.
From: Understanding atmospheric processes: insights from the comparison between Beijing and Hyytiälä
a Locations of SMEAR II (Blue) and BUCT/AHL (Red) stations. b The definition of clean air mass transport sector (blue shaded area) for SMEAR II. c The definition of the populated area with high anthropogenic emissions (red shaded area) for BUCT/AHL. In (b, c), the transition from yellow to red represents increasing population density and urbanization. Map data: (a) base map from Google Maps (retrieved 1 May 2024), and (b, c) base map and population data from the Global Human Settlement Layer for 2020 (GHSL100, CC BY 4.0).
