How much is the March 17 Xi security line?

The limit number has been lifted, and it is unlimited. In addition, the emergency headquarters Municipal Office of Heavy Pollution Weather decided to reduce the level II response to level IV from February 16 18. All member units are requested to organize relevant emergency response work according to the division of responsibilities and level IV emergency response requirements. The vehicle restriction was lifted at 0: 00 on February 17. Hope to adopt