A study by Israel’s Sheba Medical Center has concluded that the wearing of facemasks protected many citizens not only from Covid-19 but also from asthma and allergies. Urgent visits to Sheba’s emergency unit during the pandemic by asthma patients dropped by 49% and hospitalizations by 65%.

https://unitedwithisrael.org/israel-sees-dramatic-drop-in-severe-asthma-due-to-face-masks/

https://www.israel21c.org/wearing-masks-for-covid-saved-us-from-asthma-and-allergies/