what is double mask?why we should use double mask? know all about it.

Double masking, with cloth and surgical masks, can prevent leakage of air and fit the contours of the face better, studies by the United States Centers for Disease Control and Prevention (CDC) has found.
CREDIT:
https://indianexpress.com/article/exp...
   • Coronavirus: कोविड के बढ़ते मामलों के...  

Disclaimer- Some contents are used for educational purpose under fair use. Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use. All credit for copyright materiel used in video goes to respected owner.