海外の記事ではかなり細かく紹介されてる
https://www.stripes.com/dod-study-says-coronavirus-transmission-risk-on-a-crowded-airplane-with-people-wearing-masks-is-low-1.648730

“We found that on cough stimulations [with the mask], there was a very large reduction in aerosol that would come from the mannequin ? greater than 95% in most cases. It greatly showed the benefit of wearing a mask during a flight for these tests,”