Covering your nose or mouth when you are in public or private spaces in contact with people you do not live with can slow the spread of COVID-19 because individuals can be contagious before the onset of symptoms.
Using a face covering protects others from your respiratory droplets. Very few people are exempt from wearing a cloth face covering in Los Angeles including children under the age of 2, those with breathing difficulties, or those instructed not to use one by a medical provider.
Source: LA Public Health