Barely Significant
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Urban airborne lead: X-ray absorption spectroscopy establishes soil as dominant source.

PLoS One · 2009 · PMC2659775 · PMID 19340295

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may be significantno p-value reported
A widespread and unrecognized problem? Soil lead reservoirs in urban cores of older cities may be significant but unrecognized sources of airborne lead.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.