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Environmental Sciences Europe
Fig. 8 | Environmental Sciences Europe

Fig. 8

From: Air quality index variation before and after the onset of COVID-19 pandemic: a comprehensive study on 87 capital, industrial and polluted cities of the world

Fig. 8

Box and whiskers plot depicting meteorological factors variations for 87 cities in the World. The data show average of the first 4 months of 2018–2021 (January 1st–April 30th). A temperature variation, B wind speed variation and C relative humidity variation. **P < 0.01, *P < 0.05, NA: P > 0.05

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