Class C, which targets buses, coaches, taxis, PHVs, HGVs and light goods vehicles (LGVs),
Class D, which targets buses, coaches, taxis, PHVs, HGVs LGVs and cars.
Most of the CAZs that are scheduled to be introduced in the UK are Class D. But cities such as Bath and Portsmouth will be Class C only, so in these cities, regular passenger vehicle drivers will not have to pay.
Finally, it’s important to note that nearly all CAZs make special exemptions for residents within the zone, Blue Badge holders and vehicles with a disabled tax class, although the scale of the exemption offered varies between cities.
Which cities are introducing CAZs?
Somewhat unsurprisingly, an increasing number of towns are planning introductions of their own clean air zones. These include
Basildon clean air zone: Opposed by local councils, this could see restrictions imposed on the A127 arterial route.
Caerphilly clean air zone: A total HGV ban is under consideration, with a clean air zone on the A472 at at Hafodrynys Hill.
Cambridge clean air zone: A clean air zone within the current Air Quality Management Area is under consideration. This could include the historic centre as well as the inner ring road.
Canterbury clean air zone: Canterbury is planning other measures to combat emissions. These include anti-idling measures and incentives for taxi and bus companies to switch to low-emission vehicles.
Cardiff clean air zone: Cardiff favours the introduction of a £2-per-day congestion charge for non-residents over a CAZ.
Coventry clean air zone: Rather than a clean air zone, the government has accepted Coventry’s targeted road improvement schemes and planned introduction of a number of cycle lanes.
Derby clean air zone: Like Coventry, Derby is proposing a range of road improvements and cycle schemes. Derby opposes the introduction of a CAZ.