Across the globe, more than two lakh new COVID-19 infections are being added every day. In view of this, many efforts are underway to stop the contagion. One of the efforts is that the WHO has mandated the use of face masks. Experts have also recommended that countries follow a universal masking policy to reduce the spread of the coronavirus.

The Indian government has also made the use of masks mandatory in public places. Last week, the Ministry of Health and Family Welfare issued a notice warning against the use of N95 masks with valves. The advisory stated that using N95 masks with valves can defeat the purpose.

While the valves filter the air that is inhaled into the mask, they don’t filter the air that exhaled out of the mask. So if the virus enters a person’s respiratory pathway and the person exhales it into the mask, the valves will then toss it out into the air without filtering it. Watch the video to learn more.

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