On September 3, 2021, the Governor signed Executive Order 21-22 which requires all individuals over the age of 2 and who can medically tolerate a face covering to wear a face covering when in indoor public places. The Executive Order also requires health care workers, school personnel, higher education personnel and students, and employees and contractors of state-owned or operated congregate facilities to be fully vaccinated, as described in the Order.
Learn more about the Illinois rules here: Illinois Rules for Masks and More