About this data

Source: Defra, Air quality statistics in the UK, 1987 to 2025

• The annual mean concentration target requires PM2.5 to be 10 µg/m³ or lower at every monitoring station in England by 2040. It is set in the Environmental Targets (Fine Particulate Matter) (England) Regulations 2023.
• The number of stations assessed has grown from 29 in 2009 to 114 in 2025. Counts of stations above and below the target are in the downloadable data.

This chart appears in Air pollution.