Impacts of the COVID-19 event on the NOx emissions of key polluting enterprises in China.

Appl Energy · 2021 · PMC7585500 · PMID 33132478

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showed a trendno p-value reported

After the Spring Festival, the ( w ) 5-day also showed a trend similar to that of the vent numbers.

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a negative trendno p-value reported

In 13 provinces, the ( w ) 5-day showed a negative trend, and the ( w ) 5-day of Anhui Province changed the most (−129.92 ± 4.20).

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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.