Fractionation of trace elements and human health risk of submicron particulate matter (PM1) collected in the surroundings of coking plants.

Environ Monit Assess · 2017 · PMC5506208 · PMID 28699118

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a slightly increasing trendno p-value reported

The global coke-making industry has a slightly increasing trend, whereas in Poland it has been maintained at a relatively stable level.

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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.