After the levels of pollution in the air decreased due to the closures imposed by the Corona virus, pollution has returned to the levels that were before the epidemic, after easing restrictions in some countries.
According to the European Space Agency, the easing of restrictions and the return of activity in some areas has practically led to a return of nitrogen dioxide levels to those recorded in 2019, noting that nitrogen dioxide is one of the most common air pollutants, and it stems from several sources, including car exhaust.
The European Space Agency used photos from China, for example, given that the country saw a significant drop in air pollutants last year.
The European Agency said: “Between February 2019 and February 2020, nitrogen dioxide concentrations in Beijing decreased by 35%, and in Chongqing, an industrial center in southwestern China, the decrease was 45%.”
It reported that, as of February 2021, Beijing had returned to similar levels, while Chongqing had nearly doubled its numbers before the start of the pandemic.