If you only pass through the middle and high risk area, the health code will not change color. Health codes do not collect personal location information, but identify health status according to the data of authoritative departments. The online saying that "it will change color when passing through the middle and high risk area" is inaccurate. If you only pass through the middle and high risk area, the health code will not change color.
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. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.