The "health code" is based on real data and can be generated by citizens or people who have returned to work through their own 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. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.
Yellow stands for poor quality, isolation shall be implemented within 7 days, and the health clock for 7 consecutive days (no more than) shall be normally turned into a green code. Red represents danger, quarantine is implemented for 14 days, and healthy punching 14 days normally turns to green code.
Those who receive the green code pass according to the code, and those who receive the red code and the yellow code need to be isolated and punched according to the regulations, and then turn into the green code after meeting the conditions.