 This study found that long-term exposure to air pollution is linked to higher rates of severe COVID-19 cases. Specifically, higher levels of particulate matter, PM2.5, nitrogen dioxide, NO2, and black carbon, BC, were associated with increased hospitalizations, intensive care unit, ICU, admissions, and deaths due to COVID-19. Additionally, Ozone-O3 was positively correlated with severe COVID-19 outcomes when adjusted for NO2. This suggests that air pollution may be playing a role in the severity of COVID-19 cases. This article was authored by Otavio Ranzani, Anna Allari, Sergio Olmos, and others.