Disposable N95/FFP1/FFP2/FFP3 Dust Mask With NIOSH Standard For Medical Industrial Safety
N95-by Niosh Standard---USA standard
FFP1/FFP2/FFP3 by CE EN149  standard---Europe standard
N95/FFP1/FFP2/FFP3 respirator is the most common types of particulate filtering face piece respirators.
In United States, NIOSH defines N95 respirator filters at least 95% of airborne particles, not resistant to oil.

Specification
European standard EN 149 defines: 
Class      Filter penetration limit (at 95 L/min air flow)     Inward leakage
FFP1       Filters at least 80% of airborne particles           <22%
FFP2       Filters at least 94% of airborne particles           <8%
FFP3       Filters at least 99% of airborne particles           <2%
These respirators are entirely or substantially constructed of filtering material.