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If the health code is displayed in black for a long time, you can contact customer service to explain the situation and solve it.
The health code is set to three colors: green, red and yellow. The yellow health code indicates that the information needs to be further improved and verified before it can pass (such as temperature measurement, etc. ), or the health pass card has expired and needs to be declared again; Red health code means: those who do not meet the travel conditions should report to the local community (village) or unit and notify the local epidemic prevention and control department when necessary; Green health code stands for: it can be passed directly.
Although the health code is only a two-dimensional code, it contains rich data information. In addition to containing the necessary personal basic information, there are authoritative data of relevant departments behind it. After background comparison and comprehensive judgment, these data form a "risk early warning" and are coded to provide the public with epidemic prevention-related information and health information. Coding rules shall be adjusted in time according to epidemic prevention and control requirements.