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![Changes in the emission and concentration of pollutant gases such as nitrogen dioxide in China between January and March 2019 and 2020 [21].](/journal/templates/html/14/64/figures/64.fig.002.svg)
Covid-19 and the Environment: Challenges and Opportunities
Research Journal of Ecology and Environmental Sciences
| Vol 1, Issue 1
Figure 2
Figure 2.
Changes in the emission and concentration of pollutant gases such as nitrogen dioxide in China between January and March 2019 and 2020 [21].