Face shields ineffective at trapping aerosols, says Japanese supercomputer

Simulation using world’s fastest supercomputer casts doubt on effectiveness in preventing spread of coronavirus

Plastic face shields are almost totally ineffective at trapping respiratory aerosols, according to modelling in Japan, casting doubt on their effectiveness in preventing the spread of coronavirus.

A simulation using Fugaku, the world’s fastest supercomputer, found that almost 100% of airborne droplets of less than 5 micrometres in size escaped through plastic visors of the kind often used by people working in service industries.

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