Near-highway pollutants in motor vehicle exhaust: a review of epidemiologic evidence of cardiac and pulmonary health risks.

Environ Health · 2007 · PMC1971259 · PMID 17688699

Europe PMC DOI

hedged sentence

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closest p

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boldest claim

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may be significantno p-value reported

It should also be noted that there may be significant heterogeneity in the types and amounts of vehicles using highways.

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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.