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. 2022 Aug 2;9:466. doi: 10.1038/s41597-022-01488-y

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Fig. 8 — Surface PM_2.5 normals (2003–2020) for January and August. The insets show western Montana and northern Idaho. Summer PM_2.5 is widely distributed with little regard to topography while winter PM_2.5 is more localized to population centers and often accumulates in confined valleys.