Aranguiz, P. “Analysis of the Measurement of the Deterioration of Air Quality in the Metropolitan Region and Its Possible Relation to the Increase in Cases of Covid-19”. Revista Geográfica De Chile Terra Australis, vol. 57, no. 1, Dec. 2021, pp. 53-74, doi:10.23854/07199562.2021571.Aranguiz53.