Abstract
The coronavirus outbreak has led several cities to come to the standstill and country lockdown within several locations to reduce coronavirus spread. Here we investigate CO2 emission, NO2 concentration, and mobility throughout EU nations and the United Kingdom (UK) from January 2019 until the end of August 2021. In accordance with the previous research obtained by Liu et al. and Le Quéré et al., as mentioned in the literature, our results show a reduction of CO2 emission for an extended period of 2020 and 2021 compared to the annual emission in 2019. This work obtained abrupt reductions of 10.66% and 4.36% in 2020 and 2021, respectively. Although the ratios and relationship between CO2 and NO2 were considered, we found that monthly NO2 concentration was reduced by 2–39% for ±1σ in 2020 and 13–34% for ±1σ in 2021 (until August) relative to 2019. Additionally, during confinements, the average annual mobility was substantially reduced by 36% for 2020 and 24% for 2021 (until August) relative to 2019. By discussing the role of distinct countries, the current study can contribute to comprehending the role of coronavirus as a huge disruptive factor in socio-economic activities, air quality, and city mobility.