Impact of lockdown associated with COVID19 on air quality and emissions from transportation sector: case study in selected Indian metropolitan cities.

Environ Syst Decis · 2021 · PMC7940867 · PMID 33717826

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a decreasing trendno p-value reported

A decreasing trend was observed in other considered cities (Fig. 3 b, 3c and 3d) where in the NO 2 concentrations were as low as 8.2, 19.1, and 11.6 μg/m 3 in Chennai, Hyderabad and Pune, compared to 11.5, 27.4, and 16.0 μg/m 3 before the lockdown and > 15, > 30, and > 12 μg/m 3 during 2019, respectively.

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