The color of the health code is related to the user's route. When going to or passing through the risk area, it will turn into a yellow code and a red code, and it will be isolated to check the nucleic acid report.
The health code is based on real data, which is declared by citizens on the Internet. After background review, the personal QR code can be generated. 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.