Long-term variation of satellite-based PM2.5 and influence factors over East China.

Sci Rep · 2018 · PMC6078948 · PMID 30082714

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a decreasing trendno p-value reported

Much research has focused on visual range variation in this region 1 – 3 , and has demonstrated that the obviously increasing haze days per year result in a decreasing trend of visibility over most of the East China region 4 .

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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.