Online selling N95 masks effect?

Online selling N95 masks, after testing the filtering effect can reach 95%, protective effect of PM2.5 is the best.

But for N95 respirators, doctors do not recommend that people wear: "theoretically, masks, protective material is closed, blocking particles the better.

Conversely, masks the more closed, more difficult to breathe, wear well may also cause dizziness due to hypoxia.

Wear a professional N95 protective masks, likely to cause breathing difficulties, particularly for patients with cardiovascular disease, more caution. ”

It is understood that, relative to the N95 mask, negative ion mask is more suitable for the average person, of course, wear the feel comfortable but also from person to person. "If this is the only inhalable particles to block into the body, disposable medical masks are also available. ”