Overview

• The decade-long study analysed data from over 500 UK monitoring sites and found NO2 levels fell by 35%.
• PM2.5 concentrations declined by 30% between 2015 and 2024.
• Days surpassing WHO safety limits decreased from 136 to 40 for NO2 and from 60 to 22 for PM2.5.
• Surface ozone rose by 17% and exceedance days doubled from 7 to 14 annually.
• Experts urge multi-pollutant policies, electric vehicles, low emission zones and strengthened cross-border cooperation to tackle remaining risks.