In general, the green code will not change color when it passes through the middle risk area. However, if the health code holder has a fever of more than 37.3 degrees and is reported by the administrator, his health code will change from green to yellow. Therefore, everyone should also pay attention to observing their physical condition.
If you stay in the high-risk area for more than 4 hours, the health code will change color.
If you leave Beijing and return to Beijing, it may lead to the invalidation of the green code. But don't worry about this situation, as long as you complete the registration in your community as soon as possible, you can get the corresponding identity according to the registration situation.
However, according to the current management regulations, people who leave Beijing and return to Beijing need to be quarantined at home for 14 days, so they may be identified as "yellow code" after reporting to the community, and can only be turned into "green code" after the quarantine expires.
As long as you don't come out of the high-risk area and go to the high-risk area, you won't change color when you get there. For specific related questions, please consult the staff of Beijing local epidemic prevention center.