You have to wear a mask inside all public buildings in Cook County starting Monday

Masks will be required indoors throughout Cook County beginning Monday, regardless of whether a person has been vaccinated. 

The Cook County Department of Public Health issued the order Friday, saying it's needed as new COVID-19 cases continue to increase due to the more contagious delta variant. 

Dr. Rachel Rubin is co-lead and senior medical officer of Cook County Department of Public Health. Rubin says "We are in a dangerous period."  

The order applies to all multi-unit residential buildings and public places such as restaurants, stores fitness clubs and public transportation in suburban Cook County. 

Chicago reinstated its indoor mask mandate effective Friday.