Multi-Scale Effects of Meteorological Conditions and Anthropogenic Emissions on PM2.5 Concentrations over Major Cities of the Yellow River Basin.

Int J Environ Res Public Health · 2022 · PMC9690158 · PMID 36429779

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a decreasing trendno p-value reported

From 2015 to 2021, the inter-annual variation of PM2.5 concentrations in the YRB demonstrates a decreasing trend, from 60 μg/m 3 in 2015 to 38 μg/m 3 in 2021.

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an increasing trendno p-value reported

The inter-month variation of PM2.5 concentrations shows a sinusoidal pattern from 2015 to 2021, with a decreasing trend from January to May, a stable period from June to August, and an increasing trend from September to December.

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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.