SmogRank / Countries / United Kingdom / 2026

Most polluted cities in United Kingdom, 2026

6 cities in United Kingdom ranked by their average PM2.5 so far (273 of 365 days); 6 above the WHO annual guideline (5.0 µg/m³). Worst: London at 9.3 µg/m³, #860 of 2,181 cities in the world. Cleanest: Cambridge at 6.2. A city needs measurements on 70% of the days to be ranked.

  1. 1LondonEngland
    9.31.9×
  2. 2Manchesterlow-cost sensorsEngland
    7.91.6×
  3. 3Birminghamlow-cost sensorsEngland
    7.31.5×
  4. 4ReadingEngland
    6.91.4×
  5. 5PortsmouthEngland
    6.71.3×
  6. 6Cambridgelow-cost sensorsEngland
    6.21.2×
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, 2026 · United Kingdom now