
The KN95 (Chinese Standard GB2626-2006) respirator mask is currently the most widely available mask for healthcare workers and is recognized by:
3M (a multinational conglomerate corporation),
the FDA (US Food and Drug Administration), and
the CDC (US Centers for Disease Control and Prevention)
as being equivalent to the US N95 (NIOSH-42C FR84) Standard.
K95 vs KN95 Performance Comparison Table

Refrences
3M Comparison of FFP2, KN95, and N95 and Other Filtering Facepiece Respirators
FDA changes course and allows China's KN95 mask to be used in US