Changes in air pollution during COVID-19 lockdown in Spain: A multi-city study.

J Environ Sci (China) · 2021 · PMC7402215 · PMID 33334512

Europe PMC DOI

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an increasing trendno p-value reported

An increasing trend of O 3 levels during lockdown can thus be seen, although there are only statistically significant differences for Barcelona and Valencia.

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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.