Global, continental, and national variation in PM2.5, O3, and NO2 concentrations during the early 2020 COVID-19 lockdown.

Atmos Pollut Res · 2021 · PMC7867708 · PMID 33584105

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an increasing trendno p-value reported

O 3 concentration showed mixed trends during lockdown and an increasing trend in many countries, which may be due to the reduction of NO 2 consumption in the titration process and changes to meteorological conditions.

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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.

Global, continental, and national variation in PM<sub>2.5</sub>, O<sub>3</sub>, and NO<sub>2</sub> concentrations during the early 2020 COVID-19 lockdown.

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