A city-level analysis of PM_2.5 pollution, climate and COVID-19 early spread in Spain

The COVID-19 outbreak has escalated into the worse pandemic of the present century. The fast spread of the new SARS-CoV-2 coronavirus has caused devastating health and economic crises all over the world, with Spain being one of the worst affected countries in terms of confirmed COVID-19 cases and deaths per inhabitant. In this situation, the Spanish Government declared the lockdown of the country.

The variations of air pollution in terms of fine particulate matter (PM_2.5) levels in seven representative cities of Spain are analyzed here considering the effect of meteorology during the national lockdown. The possible associations of PM_2.5 pollution and climate with COVID-19 accumulated cases were also analyzed.

While the epidemic curve was flattened, the results of the analysis show that the 4-week Spanish lockdown significantly reduced the PM_2.5 levels in only one city despite the drastically reduced human activity. Furthermore, no associations between either PM_2.5 exposure or environmental conditions and COVID-19 transmission were found during the early spread of the pandemic.

A longer period applying human activity restrictions is necessary in order to achieve significant reductions of PM_2.5 levels in all the analyzed cities. No effect of PM_2.5 pollution or weather on COVID-19 incidence was found for these pollutant levels and period of time.

The online version contains supplementary material available at 10.1007/s40201-022-00786-2.