For residents in high and medium risk areas, the health code will automatically change to the corresponding color from the day when the State Council designated the area as a high and medium risk area. After the risk area is downgraded, the color of the health code will also change.
After the green code holder enters the high and medium risk area, the health code will automatically change color as long as he stays for 1 hour and the mobile phone is turned on and can receive communication roaming information.