Yes. Government guidelines set out different classes of Clean Air Zones, which charge different groups of vehicles. These CAZ classes are shown below:
- Class A – Bus; coach; taxi and private hire
- Class B – Bus; coach; Heavy Goods Vehicle (HGV); taxi and private hire
- Class C – Bus; coach; HGV; large van; minibus; small van/light commercial; taxi and private hire
- Class D – Bus; coach; HGV; large van; minibus; small van/light commercial; cars, taxis and private hire
The Government guidance requires the CAZ classes above to be assessed in that order of preference (class A, then class B, etc). This means that a higher class of CAZ can only be considered if the lower class will not improve air quality in Bristol enough to meet legal requirements.
Whichever class is chosen, Euro 4 petrol (approx. 2006) vehicles or a Euro 6 diesel (approx. 2015) vehicles would not be charged, nor would electric or hydrogen powered vehicles.
Further information can be found in the Clean Air Zone Framework, which sets out principles that should be followed when setting up a CAZ in England.