Air pollution has been recognized as a contributing factor to respiratory illnesses, COVID-19 among them. More use of public transportation instead of driving h

Air pollution has been recognized as a contributing factor to respiratory illnesses, COVID-19 among them. More use of public transportation instead of driving has actually been advocated as a public-health goal in some regions. The idea is that as long as masks are used on public transportation, the societal benefits of less driving outweigh the individual risks of COVID-19 transmission.