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Now, it has been a long time since the mask has become a necessity. Here are the results of experiments by mask type to see how much bacteria grow inside the bitter mask, which has a high temperature and humidity these days.

This is reporter Song In-ho.

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Citizens who have found the shade of an outdoor park amidst the heat around 30 degrees, mostly wear masks.

[Yoo Jung-soo/Pregnant woman: I feel that KF94 is a bit safer, so I use it in places like many people.]

[Choi Eun-sun/Housewife: In summer, it was hot and short of breath, so I switched to a dental mask. ]

How does the temperature and humidity inside the mask change when walking with a mask outdoors?

I experimented with KF94 and 4 kinds of masks such as splash blocking, cotton, and dental.

After walking 1km with each mask and measuring the humidity inside the mask in 100m increments, all four types exceeded 80%.


It is almost twice the humidity of the atmosphere.

The temperature inside the mask was also up to 2 degrees higher than the skin surface.

Discomfort was greatest when wearing a KF94 mask with excellent filter function.

[Han Sung-gyu/KF94 Mask Test Subject: Sweating is condensed right now. It's hot. KF94 is really stuffy.] The

problem is that the humidity and temperature inside the mask are high, so bacteria can easily grow.

Bacteria culture experiments were conducted with four types of masks used for a day, and bacteria found in the skin and mouth were detected in all masks.

In particular, cotton masks and KF94 masks produced the most bacteria, and some masks also detected antibiotic-resistant bacteria called superbacteria.


[Sinhuibong / Chun Hyang Bucheon Hospital Laboratory Medicine Professor: the relatively permeability characteristics than other masks KF94 mask off itgoyo one likely to fungi has been more detection -

experts writing in the hot summer months outdoors, preferably breathable mask They say they have to change them often, regardless of their type.

[Kim Ho-joong/Professor, Department of Emergency Medicine, Bucheon Hospital, Soonchunhyang University: Staphylococcus aureus and streptococcus are very fatal for people with reduced immunity, so I should never let others wear my masks, and mask them for more than a day. It is recommended to refrain from using it as much as possible.]

It is also necessary to prepare specific guidelines from the quarantine authorities regarding the wearing of masks in the vehicle.

(Video coverage: Jang Un-seok, Park Hyun-cheol, Video editing: Lee So-young, VJ: Shin So-young, Filming cooperation: Dong-Atsuka)