Association of air pollution with outpatient visits for respiratory diseases of children in an ex-heavily polluted Northwestern city, China.

BMC Public Health · 2020 · PMC7265648 · PMID 32487068

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showed a trendno p-value reported

The possible explanation is that the air pollution level in Shanghai of 2013–2015 showed a trend of rising, but it has been persistently declining in Lanzhou since 2013 [ 36 ].

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