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Both those sources are the same paper, fyi. Found a PDF here: http://www.soliftec.com/NonExhaust%20PMs.pdf

And the claim is a bit dubious, imo. It looks like they're counting "resuspension" (kicking up existing settled PM2.5 in the wake) as a source.

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The first link cites multiple papers, including the one in the second link. Looks like the study that mentions "resuspension" is a different study[1] than the one in the second link.

[1]https://www.sciencedirect.com/science/article/abs/pii/S13522...

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