The spatial heterogeneity of the impact of PM2.5 on domestic tourism flows in China.

PLoS One · 2022 · PMC9337672 · PMID 35905128

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an increasing trendno p-value reported

At the same time, PM 2.5 levels did not show an increasing trend nationwide, resulting in apparent spatial heterogeneity; thus, we need to analyze the domestic tourism flows and PM 2.5 from the perspective of spatial heterogeneity.

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a decreasing trendno p-value reported

On the contrary, the domestic tourism flow in some individual cities has shown a decreasing trend, especially in Suihua City.

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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.