Not sure if my studies in "air flow through an orifice" might be of assistance .. but .. lest one sounds like darth vader .. the mask is not doing much ... the false sense of security doing more to spread than to prevent at this point.... and to be honest .. if a lockdown is to be contemplated .. it has to be a full lockdown .. Australia / NZ style.
The data is in on the Sweden experiment .. and they were better off than the masked nations.
I am not anti mask .. just pro science
A loose fitting cloth mask does squat .. when you sneeze in the grocery line with mask on .. what happens ???? "Air flow through an orifice" remember ? the dude behind you gets a concentrated blast of what ever you are carrying .. OH .. Shart .. thats bad right ? and it blasts throughout the room ..
and in this example .. even if you have the Darth Vader mask .. if the seal is broken by the sneeze .. we are still in trouble.
Full lockdown is the only way to prevent spread.