Question to the Department for Environment, Food and Rural Affairs:

To ask the Secretary of State for Environment, Food and Rural Affairs, what assessment her Department has made of the effectiveness of the Class B Clean Air Zone in Portsmouth at reducing NO2 levels; and what assessment she has made of the potential merits of introducing a Class D Clean Air Zone.

Portsmouth’s Class B Clean Air Zone has been operational since November 2021. Data for 2022 will be published as part of the 2022 National Compliance Assessment. Government guidance is clear that a Clean Air Zone should only be implemented by a Local Authority in the NO₂ Programme where non-charging measures are unable to achieve compliance with legal NO₂ levels in the shortest possible time.