People rarely talk, laugh or scream on public transport, so the risk is much lower compared to somewhere like a bar or hospital. Also, I’m talking about relative contamination levels. Even if you’re only lightly exposed for 20 minutes, the concentration of virus on your mask is probably ~hundreds of times higher than the concentration on your clothes.
Consider the volume of air you breathe in 20 min. 95% of the virus in that air is now on your mask. Compare that to the volume of virus that settles out of the air onto your clothes. Considering COVID can remain in air for hours, that amount is likely much smaller.
People rarely talk, laugh or scream on public transport, so the risk is much lower compared to somewhere like a bar or hospital. Also, I’m talking about relative contamination levels. Even if you’re only lightly exposed for 20 minutes, the concentration of virus on your mask is probably ~hundreds of times higher than the concentration on your clothes.
Consider the volume of air you breathe in 20 min. 95% of the virus in that air is now on your mask. Compare that to the volume of virus that settles out of the air onto your clothes. Considering COVID can remain in air for hours, that amount is likely much smaller.