Air quality assessment based on R/S-SPA composite model: A case study of the Hebei province (China).

Front Public Health · 2022 · PMC9574194 · PMID 36262232

Europe PMC DOI

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a positive trendno p-value reported

Combined with the analysis results of R/S and SPA, it is found that the major pollutants will have a positive trend in the future.

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an increasing trendno p-value reported

Furthermore, air quality is affected by six major pollutants, and variation coefficients, such as PM 2.5 , PM 10 , and SO 2 , show an increasing trend.

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a decreasing trendno p-value reported

Furthermore, the six indicators involved in the monitoring of the concentration of major air pollutants in the Hebei province show a decreasing trend of varying degrees in 2013–2020.

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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.