Effects of air pollution and climatology on COVID-19 mortality in Spain

The health, economic, and social impact of COVID-19 has been significant across the world. Our objective was to evaluate the association between air pollution (through NO(2) and PM(2.5) levels) and COVID-19 mortality in Spanish provinces from February 3, 2020, to July 14, 2020, adjusting for climatic parameters. An observational and ecological study was conducted with information extracted from Datadista repository (Datadista, 2020). Air pollutants (NO(2) and PM(2.5) levels) were analyzed as potential determinants of COVID-19 mortality. Multilevel Poisson regression models were used to analyze the risk of mortality after severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Models were adjusted by four climatic variables (hours of solar radiation, precipitation, daily temperature and wind speed) and population size. The mean levels of PM(2.5) and NO(2) across all provinces and time in Spain were 8.7 μg/m(3) (SD 9.7) and 8.7 μg/m(3) (SD 6.2), respectively. High levels of PM(2.5) (IRR = 1.016, 95% CI: 1.007–1.026), NO(2) (IRR = 1.066, 95% CI: 1.058–1.075) and precipitation (IRR(NO2) = 0.989, 95% CI: 0.981–0.997) were positively associated with COVID-19 mortality, whereas temperature (IRR(PM2.5) = 0.988, 95% CI: 0.976–1.000; and IRR(NO2) = 0.771, 95% CI: 0.761–0.782, respectively) and wind speed (IRR(NO2) = 1.095, 95% CI: 1.061–1.131) were negatively associated with COVID-19 mortality. Air pollution can be a key factor to understand the mortality rate for COVID-19 in Spain. Furthermore, climatic variables could be influencing COVID-19 progression. Thus, air pollution and climatology ought to be taken into consideration in order to control the pandemic. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s11869-021-01062-2.