When the red QR code appears, it means that the code owner may be a person from or passing through a key epidemic area, or a close contact of a confirmed case, a suspected case or an asymptomatic close infected person during the centralized isolation period.
People in red team should stay at home or be isolated for 14 days, and turn to green code after continuous declaration of health punch 14 days. Health codes are based on real data and can be generated by citizens or people who have returned to work through online declaration and background audit. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city.