A critical review of naphthalene sources and exposures relevant to indoor and outdoor air.

Int J Environ Res Public Health · 2010 · PMC2922736 · PMID 20717549

Europe PMC DOI

hedged sentence

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may be significantno p-value reported

Fourth, source-sink effects for naphthalene may be significant, and can complicate the collection of representative samples and the identification of primary (not re-emitting) sources.

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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.