It maybe the proximity of contact, time spent enclosed and circulation of air, public transport may only be a 5- 10 minute ride wear as gym, churches, restaurants could be possibly an hour. Indoor air circulation is not cleaned/treated just move the virus around, airlines use HEPA FILTERS which clean and filter air. Wearing a quality MEDICAL GRADE possibly will help in different close proximity locations unfortunately it is impossible to wear eating or drinking bars/restaurants.
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