Chicago re-instates mask mandate Aug 17, 2021 | coronavirus, Top Stories Chicago will again require people to wear masks in indoor public settings starting Friday to help curb the spread of a COVID-19 surge fueled by the highly transmissible delta variant.To access this content, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users, or log in if you are a member.