Answer:
Signage on roads in and around the zone, showing a white cloud symbol within a green circle, will indicate that a Clean Air Zone scheme is in operation. A letter A–D will also be included on the symbol (see images below), denoting the class of zone that applies.
![4 icons showing the white cloud in the green circle of a Clean Air Zone with each lettered A to D denoting the type of vehicles that are charged in the zone](https://www.patrol-uk.info/wp-content/uploads/2021/03/4-icons-showing-the-white-cloud-in-the-green-circle-of-a-Clean-Air-Zone-with-each-lettered-A-to-D-denoting-the-type-of-vehicles-that-are-charged-in-the-zone-768x167.png)
The 4 x ascending lettered classes relate to the different groups of vehicle that are charged, as follows:
• Class A: Buses, coaches, taxis, private hire vehicles
• Class B: Buses, coaches, taxis, private hire vehicles, heavy goods vehicles
• Class C: Buses, coaches, taxis, private hire vehicles, heavy goods vehicles, vans, minibuses
• Class D: Buses, coaches, taxis, private hire vehicles, heavy goods vehicles, vans, minibuses, cars (the local authority also has the option to include motorcycles)
Please note that a number of Clean Air Zone exemptions and discounts apply to different zones.