However, in the trend of decreasing pollutants concentration, ozone shows either an increasing trend or remains unchanged in most of the cities during the lockdown period (Yin et al. 2021a ; Peralta et al. 2021 ).
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However, in the trend of decreasing pollutants concentration, ozone shows either an increasing trend or remains unchanged in most of the cities during the lockdown period (Yin et al. 2021a ; Peralta et al. 2021 ).