Change in Air Quality during 2014-2021 in Jinan City in China and Its Influencing Factors.

Toxics · 2023 · PMC10056825 · PMID 36976975

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a decreasing trendno p-value reported

However, SO 2 concentration shows a decreasing trend in 2010–2020 [ 65 ].

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an overall trendno p-value reported

The annual average PM 2.5 concentration over North America decreased from about 22 μg/m 3 in 1981 to 8 μg/m 3 in 2016, with an overall trend of −0.33 μg/m 3 per year [ 71 ].

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