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In Hat Yai, Thailand, the NO2 levels abated by 33.7% (Fig. 1), respectively, in the initial 3 weeks of the lockdown period than the similar phase, before the lockdown period. The NO2 tropospheric readings recorded over the ground site and regionally including the spatial mean over the urban regions of the city were obtained from Sentinel-5P, which corresponds with the depletion levels derived from the ground site (Stratoulias and Nuthammachot 2020).
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The Ontario region in Canada announced a state of emergency (SOE) in March 2020 to restrict the COVID-19 cases. A 5-week phase in the SOE period was analyzed against an earlier five-week duration as a benchmark. Ozone concentrations at 12 of the 32 recorders were less than the preceding 5-year phase. The mean ozone levels were 1 ppb less in the SOE phase. However, it varied from 1.5 up to 4.2 ppb, which was lower than the long-lasting circumstances (Adams 2020). Conversely, increase in ozone levels was found in Rio de Janeiro, Brazil, due to the rise in NMHC/NOx throughout social distancing, enforced due to the atmospheric chemistry in Rio de Janerio, regulated within VOC-monitored circumstances. The proportions of non-methane hydrocarbons and nitrogen oxides or NMHC/NOx increased around 37.3% throughout the incomplete lockdown, according to the surveying data derived from two automated surveying sites. However, the rise was substantial when air clouds appeared from industrial regions, due to the large rise in VOC reactivity from the clouds, which are high in aromatic compounds (Siciliano et al. 2020). Similarly, an approximate rise of 30% in ozone was noticed in urban regions, largely determined by automobile traffic, possibly associated with nitrogen monoxide reduction (Nakada and Urban 2020; Urban and Nakada, 2021).