Nitrate pollution in the Warta River (Poland) between 1958 and 2016: trends and causes.

Environ Sci Pollut Res Int · 2019 · PMC6338712 · PMID 28803424

Europe PMC DOI

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an increasing trendno p-value reported

An increasing trend in nitrate concentrations is visible from the start of the observation period (1958) to the early 1990s.

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highly significantno p-value reported

Using long-term data, Howden and Burt ( 2008 ) reported a highly significant positive correlation between the annual mean nitrate concentration and the concentration of N–NO 3 from 1978 to 2007 in the Frome and Piddle catchments in Dorset (UK).

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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.