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They are wearing cloth masks. They are much less effective than an N95, but they don't contribute to any kind of significant CO2 buildup:
https://intermountainhealthcare.org/blogs/topics/covid-19/2020/07/debunking-common-face-mask-misconceptions/#:~:text=Wearing%20a%20cloth%20mask%20will,up%20inside%20the%20mask.

Hello @altleft , Excellent information, it is nice to see useful information for understanding and clarify any doubts that may exist.


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True but, it do not accumulate that much to cause problems, because is cloth. Altleft did a good research of it i think :)

HI @yusrizakaria , Thank you for sharing, however to be able to circulate in the streets and public places, especially in medical centers, the mandatory use of the mask is required.


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