What to pay attention to when buying a mask, how to wear it?

What to pay attention to when buying a mask, how to wear it?
Attention when buying a mask
1. No need to choose professional protective masks
It is not necessary to wear professional protective masks such as N95 and N99 in order to filter PM2.5. In theory, the more closed the protective material of the mask, the better the effect of blocking particles.

Conversely, the more closed the mask, the more pronounced the increase in breathing resistance, and the harder it is to breathe. Wearing professional protective masks such as N95 and N99 must be trained, otherwise it is easy to cause breathing difficulties and dizziness due to lack of oxygen.

2. Purchase regular masks

At present, there is no standard for civilian masks in the country. The quality of masks on the market varies, so you must choose large-brand masks with formal product packaging and instructions, such as disposable medical surgical masks or 12-layer gauze masks. Don't try to be cheap, buy masks on stalls without sanitation permits.