Diagnostic Comparison of Changes in Air Quality over China before and during the COVID-19 Pandemic

<p>The rapid spread of Covid-19 has affected the political, social, and economic sectors, which inevitably will also affect the environmental component. This contagious virus led the worldwide countries to make securities measures such as lockdown to reduce the spread of COVID-19 and protect human health. In contrast to the negative impacts of this virus on the economy, it has influenced the environment positively. As reported by station and program for monitoring the Earth, the air quality has improved after the lockdown. The present study compares the air level pollution one year before and during the spread of Coronavirus in China. Accordingly, we investigate the change of the concentrations of three air pollutants, namely, O₃, NO₂, and black carbon. The study of the measured parameter between December 2019 and March 2020 exhibit an apparent decrease in their concentrations because of the imposing lockdown of cities and restriction on chemical industries and factories.</p><p>
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