To cope with the challenging situation of epidemic prevention and control, 31 provinces, municipalities and autonomous regions released rules for trans-provincial travel. People from different risk-level areas have to abide by the following requirements or possess the following materials when traveling to the indicated cities:
 
To Harbin, Heilongjiang province
 
From low-risk areas: a green health code.
From medium or high-risk areas: report to their community (village) or company or the hotel they are staying at, a 14-day isolated medical observation, a 7-day community health management period, three nucleic acid tests.