Clean Air Zone 2 – ​ Heavy Goods Vehicles (HGVs) and Light Goods Vehicles (LGVs) that do not meet the Euro VI/6 (Diesel) and Euro IV/4 (Petrol) emission standards.
Ardal Aer Glân 2 – Cerbydau Nwyddau Trwm (HGV) a Cherbydau Nwyddau Ysgafn (LGV) nad ydynt yn bodloni safonau allyriadau Ewro VI/6 ac Ewro VI/4.