Notes on the particulate matter standards in the European Union and the Netherlands.

Int J Environ Res Public Health · 2009 · PMC2672387 · PMID 19440439

Europe PMC DOI

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a clear trendno p-value reported

There is a clear trend of gradually decreasing concentrations of PM 10 .

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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.