How effective are ordinary disposable masks
Ordinary masks are made of polypropylene non-woven fabrics, which can only block droplets. In layman's terms, if you take it for surgery and tell a joke on a whim, the saliva will not splash on the stage, and the blood on the stage will not easily splash into your mouth.
Before answering how big the effect is, we must first clarify a thought:
This kind of mask is to prevent you from "polluting" the environment, not to prevent the environment from "polluting" you.
A simple example, Zhang San, has seasonal allergies, and it is grass powder or pollen that causes Zhang San's runny nose, dry, itchy throat and watery eyes. So after Zhang San puts on the ordinary disposable mask above, will his allergic symptoms be alleviated because the mask blocks the pollen? The answer is no, not only the flow will flow, but the sultry air inside the mask will also make the Zhang San was even more uncomfortable. Since ordinary disposable masks cannot prevent pollen from being inhaled by Zhang San, let alone pathogens smaller than pollen.