Porto Di Mezzo has a low emission zone in place, also called ZTL in Italian.
Until further notice:
No 2 stroke motorcycles & mopeds
Petrol cars Euro 2
Diesel cars Euro 4
Diesel goods vehicles Euro 2
8:30 - 12:30 and 14:30 - 18:30
Has signs similar to this, a banned vehicle sign with the requirements below:
8:30-12:30 and 14:30-18:30 until further notice
There is currently no Italian national scheme, but regional as well as individual city schemes.
Zona a Traffico Limitato (ZTL) or Limitazioni della circolazione, the general name for all access regulation schemes, also used for Low Emission Zones.