Global Trends of Acidity in Rainfall and Its Impact on Plants and Soil.

J Soil Sci Plant Nutr · 2023 · PMC9672585 · PMID 36415481

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a decreasing trendno p-value reported

Although being the world’s most severe SO 2 polluter, the North China Plain (NCP) experienced a decreasing trend of SO 2 since 2011, with about a 50% reduction from 2012 to 2015.

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an increasing trendno p-value reported

The events for the occurrence of acid rain (pH < 5.6) across India showed an increasing trend over the past four decades (Bhaskar and Rao 2017 ).

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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.