Abrupt but smaller than expected changes in surface air quality attributable to COVID-19 lockdowns.

Sci Adv · 2021 · PMC7806219 · PMID 33523881

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an increasing trendno p-value reported

However, there is an increasing trend in O 3 levels at urban background sites during the same periods in 2016–2019 ( Figs. 2 and 3), with P dew values ranging from +12.1 ± 9.1% in New York to +51.2 ± 23.4% in Milan (auxiliary data table S1).

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