Many places have issued notices. While checking the health code, check the vaccination mark in COVID-19. People who have been vaccinated with COVID-19 vaccine can move freely. The health codes of unvaccinated people are displayed in gray. So the gray health code means you haven't been vaccinated against COVID-19. Vaccination should be given as soon as possible.
Vaccination with COVID-19 vaccine is the most effective way to prevent COVID-19 infection. Now, in order to make people actively vaccinate COVID-19 vaccine, health codes have been upgraded everywhere, and those who have completed the whole immunization with COVID-19 vaccine will get golden health codes.