Clean Air Zone 1

A clean air zone (CAZ) defines an area where targeted action is taken to improve air quality and resources are prioritised to deliver improved health benefits. In CAZs, some drivers may be required to pay a daily charge to enter, or move within, a zone if they are driving a vehicle that does not meet the particular standard for their vehicle type in that zone. The white on green ‘cloud’ symbol is used to indicate a CAZ. The 4 classes of CAZ are indicated by the letter (A, B, C, D) shown on the ‘cloud’ symbol. For more information about CAZ, visit Driving in a clean air zone. This zone entry sign shows the name of the traffic authority in the top panel, the class of the CAZ in the middle panel and the period of operation and details of the method of payment in the bottom panel. The period of operation may be omitted if the CAZ is operational at all times. More details of the charges and payment methods are available from the appropriate traffic authority.