Surveillance for face mask compliance, Chennai, Tamil Nadu, India, October-December, 2020.
PurposeGovernment of Tamil Nadu, India, mandated the face mask wearing in public places as one of the mitigation measures of COVID-19.We established a surveillance system for monitoring the face mask usage.This study aimed to estimate the proportion of the population who wear face masks appropriately (covering nose, mouth, and chin) in the slums an