Air Quality during COVID-19 in Four Megacities: Lessons and Challenges for Public Health.

Int J Environ Res Public Health · 2020 · PMC7400368 · PMID 32674410

Europe PMC DOI

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an overall trendno p-value reported

The graphs show an overall trend during March 2020 of CO and NO 2 reductions and O 3 formation, related to traffic flow reductions.

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