Asymmetric nexus between air quality index and nationwide lockdown for COVID-19 pandemic in a part of Kolkata metropolitan, India.

Urban Clim · 2021 · PMC9764146 · PMID 36569423

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a decreasing trendno p-value reported

an increasing trendno p-value reported

(12) Z = s − 1 Var S ; if S > 0 0 ; if S = 0 S + 1 Var S ; if S < 0 A positive Z value of the Mann-Kendall test reveals an increasing trend of data series, and a negative value represents a decreasing trend of data series.

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a definite trendno p-value reported

But alternative hypothesis (H 1 ) confirms there is a definite trend (increasing or decreasing) of air quality index over time.

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