The main function of the mask
is to filter the air entering the mouth and nose to block harmful gases, odors, droplets, viruses and other substances.Most of the masks
we generally use are made of non-woven fabrics and melt-blown fabrics, which are breathable and environmentally friendly, and the unit price is not high.
However, there are two very expensive masks in the world. One is a gold mask from India, worth 2.899 million rupees; the other is in Israel, the mask is inlaid with gold and diamonds, worth 1.5 million US dollars.
For ordinary people, a cheap and effective protective mask
is more important.After all, masks
have a price, and health cannot be bought.