What is the difference between KF94 mask and normal mask? 
                                       normal mask                             /                          KF94 mask 
      
- Purpose :   For protection against cold           /           to prevent yellow dust, disease
 2.  Quarantine ability :  Unable to block fine particles      /      Can block fine dust 
      3.  Certification :  Not needed          /        KF94 mask approved by the Korean Ministry of Food and Drug Safety