According to researchers from the University of Birmingham in the United Kingdom, there is 'compelling' evidence to show that air pollution increases Covid-19 infections, hospital admissions and deaths. Even a small increase in people's long-term exposure to pollution could increase infections and admissions by approximately 10% and deaths by 15%, suggests the study. The research also looked at other factors including obesity, population density and age. However, scientists have not proven a causal link between air pollution and worse coronavirus impacts. Conclusive evidence will only come with large amounts of data on individual people, which is not yet available. The paper is set to be published in the journal Environmental and Resource Economics and has been reviewed by independent scientists.