No cars, motorcycles or scooters will be allowed on the streets of Milan with 1.3 million inhabitants from 10:00 am to 4:00 pm (0900 to 1500 GMT), city officials said.
Drivers in Milan will face a limit on daytime travel three days next week as the northern Italian city tries to bring air pollution down from dangerous levels. Authorities also announced on Wednesday a special "anti-smog" ticket that allows people to ride public transport all day for 1.50 euros ($1.65).
A lack of rainfall has led pollution levels to climb in recent weeks. That has prompted the administration of the Lombardy region, of which Milan is the capital, to appeal to localities to cancel traditional New Year fireworks displays to prevent the smog worsening.