Should Chongqing North Railway Station be isolated for 4 hours?

Chongqing North Railway Station stays for 4 hours without isolation. According to the relevant public information inquired, according to the regulations of the communication travel card, as long as the stay is less than 4 hours, it will not be given a travel code. Recently, the epidemic situation in Chongqing is serious, with more than 2,000 consecutive cases, which is a medium-high risk area.