COVID-19 and Air We breathe in

In a dense urban area in Nigeria, most residents have no access to private outdoor space and rely on public parks for exercise due to Covid-19, the mental health boost that comes from a connection with nature, and fresh air. Conscientious city dwellers now ponder how to maintain safe social distance while sharing limited outdoor space with others. Official recommendations in the Nigeria have converged on 6 ft of distance as the rule of thumb for avoiding the exchange of potentially infective respiratory droplets and aerosols, but these recommendations were devised on the basis of observations made in the 1930s for hospital environments. Do they hold for outdoors, in a breeze?