SmogRank / Countries / United Kingdom / May 2026

Most polluted cities in United Kingdom, May 2026

7 cities in United Kingdom ranked by their average PM2.5 over the 31 days. Worst: London at 10.3 µg/m³, #410 of 2,243 cities in the world. Cleanest: Cambridge at 5.7. A city needs measurements on 70% of the days to be ranked.

  1. 1LondonEngland
    10.3
  2. 2DartfordEngland
    8.5
  3. 3Birminghamlow-cost sensorsEngland
    7.9
  4. 4PortsmouthEngland
    6.9
  5. 5ReadingEngland
    6.4
  6. 6Manchesterlow-cost sensorsEngland
    6.0
  7. 7Cambridgelow-cost sensorsEngland
    5.7
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, May 2026 · United Kingdom now