Starting from 10:00 p.m. on May 31, passengers leaving Guangzhou through airports, railways, and highway passenger stations within the jurisdiction of Guangzhou (excluding transit passengers from other places) must present the "Health Code" green code and hold it for 72 hours. Negative certificate of internal nucleic acid test. Passengers who are unable to depart on time due to failure to issue a negative nucleic acid test certificate in time can apply for free refund and change.