Why Wearing A Bandana Face-mask Is A Very Bad Idea

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Types of mask

Face coverings are a vital tool in reducing the spread of coronavirus. But little research has been done into how different kinds of masks compare.

Agencies2/5

Study findings

A new study has ranked 14 types of commonly available masks, finding that medical masks offer significantly more protection against droplet spread than cotton alternatives - while bandanas and balaclavas don’t do much at all.Agencies3/5

Transmission studies

A team of scientists at Duke University, US, created an inexpensive setup: People stood in a dark room and spoke the words "Stay healthy, people" five times into the direction of an expanded laser beam, which was recorded with a cellphone camera. A computer algorithm was then used to calculate the number of droplets. Agencies4/5

Surgical masks

Professionally-fitted N95 masks - hospital-grade protection worn by frontline workers in hospitals - reduced droplet transmission to less than 0.1 per cent. Surgical or polypropylene masks were not far behind, bringing droplet transmission down by 90 per cent or more compared to no face-coverings.Agencies5/5

Cotton alternatives

Hand-made cotton face coverings eliminated 70 to 90 per cent of the spray, depending on the layers and the pleating. But bandanas only reduced the droplets by about 50 per cent and neck fleeces increased the amount of spray, probably by dispersing the largest droplets into many smaller droplets. PTI

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