The linked study actually uses FFP2 masks, not N95. Here's a relevant part from the abstract regarding how an FFP2 performs: > We find, for a typical SARS-CoV-

The linked study actually uses FFP2 masks, not N95. Here's a relevant part from the abstract regarding how an FFP2 performs: > We find, for a typical SARS-CoV-2 viral load and infectious dose, that social distancing alone, even at 3.0 m between two speaking individuals, leads to an upper bound of 90% for risk of infection after a few minutes. If only the susceptible wears a face mask with infectious speaking at a distance of 1.5 m, the upper bound drops very significantly; that is, with a surgical mask, the upper bound reaches 90% after 30 min, and, with an FFP2 mask, it remains at about 20% even after 1 h. When both wear a surgical mask, while the infectious is speaking, the very conservative upper bound remains below 30% after 1 h, but, when both wear a well-fitting FFP2 mask, it is 0.4%.