• Harvard University professor explains how to tell if the mask is on correctly

After almost a year of pandemic and suffering the consequences of the coronavirus crisis , we should all already know which masks we should use and how we should use them correctly , although it seems that many have not yet learned . But how do we know if we are wearing it properly?

Harvard University Associate Professor Joseph G. Allen has answered this question in an article published in The Washington Post. The expert has assured that the entire population should use the N95 type masks , whose approximate equivalent in Spain are the FFP2 .

Allen explains that the filtration efficiency of the mask does not only depend on its characteristics or capacity, but also on its correct use and fit. “It does n’t do much good if your breath can escape from the sides or the top . The mask should pass over the bridge of the nose, go down around the chin and be flush against the cheeks, ”he clarifies.

The expert gives a trick to know if it is correctly placed : put your hands on the mask and exhale gently. If you don’t feel the air coming out of the sides or rising towards your eyes, that’s fine. Then you must move your head to both sides and check that the mask has not moved.

He also recommends reading this text aloud to test if the mask has dislodged when you speak:

“When sunlight shines on raindrops in the air, they act like a prism and form a rainbow. The rainbow is a division of white light into many beautiful colors. These take the form of a long rounded bow with its high pass above, and its two ends are apparently beyond the horizon. There is, according to legend, a pot with boiling gold at one end. People look, but no one ever finds it. When a man searches for something beyond reach, his friends say that he is looking for the golden bowl at the end of the rainbow. “