A recent Harvard analysis is the first study to show a statistical link between COVID-19 deaths and other diseases associated with long-term exposure to fine particulate matter.
In an analysis of 3,080 counties in the United States, researchers at the Harvard University T.H. Chan School of Public Health found that higher levels of the tiny, dangerous particles in air known as PM 2.5 were associated with higher death rates from the disease.
The paper goes on to suggest that just a slight increase in long-term pollution exposure could have serious coronavirus-related consequences, even accounting for other factors like smoking rates and population density.
Covid-19 (Coronavirus) news from BBC