“…Our random forest model showed the importance of the long-term exposure to PM 10 on the COVID-19 severity and mortality prognosis versus other clinical variables clearly stated as comorbidities, such as COPD/asthma , cancer , diabetes and obesity, among others ( Cardamone and Donatiello, 2020 , Kong et al, 2021 , McGurnaghan et al, 2020 , Mohammad et al, 2021 , Oh and Song, 2021 ). Notwithstanding, we also found that age, sex (male) and obesity significantly increased the severity of COVID-19, which is in agreement with other studies ( Elezkurtaj et al, 2021 ).…”