COVID Masks: Mechanistic View: Part 2: Fine Aerosol Emissions:

Masks may increase fine aerosol emissions from: 1) nebulization of large droplets into fine aerosols, or 2) friability of certain mask materials creating "aerosolized fomites."

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Here are the studies:

The question is whether facemasks are actually a source for viral aerosols by:

1) Masks get saturated by large "respiratory droplets" containing viral molecules. Air turbulence against trapped droplets may create aerosols that eventually diffuse around edges. Continued...

Trapped droplets potentially get pushed through the filter media of the mask, getting nebulized into aerosols.

Particles don't always stay in the mask:

Study: Ha'eri 1980

Title: The efficacy of standard surgical face masks: an investigation using "tracer particles"

Albumin tracer particles put inside a surgical mask were dispersed into the room by breathing.

Viral molecules can get airborne from air turbulence.

Study: Liu 2020
Title: Aerodynamic analysis of SARS-CoV-2 in two Wuhan hospitals.
SARS-2-COV sub-micrometer aerosols not tightly bound to surfaces, get airborne when PPE is taken off.