Will Changsha turn yellow when it receives the time-space cross message from the epidemic control center?

Yes The intersection of time and space refers to the mobile phone number that collides with the same base station in the outdoor open space within a specified time, and is defined as the intersection of time and space that may be exposed. The infected person has been somewhere within 14 days, and the trajectory of this 14 day crosses with him. Whether it is physical clearance or communication signal drift, the health code will turn yellow after being detected by the system.