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. Author manuscript; available in PMC: 2021 May 1.
Published in final edited form as: Environ Sci Pollut Res Int. 2020 Feb 14;27(13):14883–14902. doi: 10.1007/s11356-019-06746-y

Fig. 1.

Fig. 1

Locations of road dust sampling sites in Philadelphia. Overlay colors are the local geological formations according to the Pennsylvania Geologic Survey (2018). Map created in ArcGIS (Esri, 2017)