SmogRank / Countries / United Kingdom / 2025

Most polluted cities in United Kingdom, 2025

6 cities in United Kingdom ranked by their average PM2.5 over the 365 days; 6 above the WHO annual guideline (5.0 µg/m³). Worst: London at 10.6 µg/m³, #552 of 2,131 cities in the world. Cleanest: Reading at 6.1. A city needs measurements on 70% of the days to be ranked.

  1. 1LondonEngland
    10.62.1×
  2. 2BexleyEngland
    9.71.9×
  3. 3Birminghamlow-cost sensorsEngland
    9.51.9×
  4. 4Manchesterlow-cost sensorsEngland
    7.91.6×
  5. 5PortsmouthEngland
    6.71.3×
  6. 6ReadingEngland
    6.11.2×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, 2025 · United Kingdom now