How to properly wear a mask?

First of all, pick before wearing masks, had to keep hands clean, do not touch the inside of the mask;

Secondly, the mask is adjacent to filtration function of the face, therefore, to take a few deep breaths after wearing, if feeling around the leak, breathing resistance increase, relocation or replacement;

Finally, wearing a face mask to be off the air every half hour, every other day or atleast 4 hours will need to be replaced.