Air Quality Before and After COVID-19 Lockdown Phases Around New Delhi, India.

J Health Pollut · 2021 · PMC8276728 · PMID 34267989

Europe PMC DOI

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a decreasing trendno p-value reported

Compared to the same time period in the previous year (2019), SO 2 concentrations showed a decreasing trend at all stations due to lockdown ( Supplemental Material Figure 2 ).

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