A 3-ply mask does not have a specific "level" in terms of protection like some other masks, such as surgical masks or respirators. The term "3-ply" refers to the number of layers the mask is made of, typically consisting of an outer layer, a middle filtration layer, and an inner layer.
These masks are generally considered to provide basic protection against respiratory droplets and are commonly used in healthcare settings or by the general public for daily activities. However, their filtration efficiency and level of protection may vary depending on the quality of the materials used and the manufacturing standards followed by the manufacturer.
It's important to note that if you require a higher level of filtration and protection, such as when dealing with hazardous airborne particles or in certain medical settings, you may need to consider using masks that meet specific standards, such as N95 respirators or masks with higher filtration ratings like ASTM Level 1, Level 2, or Level 3 surgical masks. These masks undergo rigorous testing and are designed to provide higher levels of protection against different types of contaminants.