1. The health code will only change color if it stays in the middle and high risk area for 4 hours. Just passing by, stop by the train and drive past, so that the health code will not change color, but the itinerary will remind you that you may have been to the middle and high risk area.
2. In the high-risk areas within the regional administrative area, if the cumulative time exceeds 4 hours in recent 14 days, it can be automatically marked as red. In this case, the local epidemic prevention department may request registration.
3. The health code is based on real data, which can be generated by citizens or people who have returned to work through online self-declaration. After background review, the personal QR code can be used as a personal entry and exit in electronic certificate.