Altitudinal dependence of PCBs and PBDEs in soil along the two sides of Mt. Sygera, southeastern Tibetan Plateau.

Sci Rep · 2018 · PMC6145894 · PMID 30232354

Europe PMC DOI

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an increasing trendno p-value reported

24 found an increasing trend of α-HCH and DDTs with the increasing altitude on the windward side but no correlation with the altitude on the leeward side.

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a decreasing trendno p-value reported

Sygera in 2015 and found out that the POP concentrations had no obvious variation on the windward side but observed a decreasing trend on the leeward side along the altitude.

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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.