SmogRank / World / United Kingdom / England / September 2025
Most polluted cities in England, United Kingdom, September 2025
49 cities in England, United Kingdom ranked by their average PM2.5 over the 30 days. Worst: Northampton at 7.5 µg/m³, #1,433 of 3,052 cities in the world. Cleanest: Saltash at 2.8. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Northampton 0%
- 2London 0%
- 3Speke 0%
- 4Leeds 0%
- 5Dartford 0%
- 6Scunthorpe 0%
- 7Plymouth 0%
- 8Hayes 0%
- 9Kingston upon Hull 0%
- 9Doncaster 0%
- 11Southampton 0%
- 11Manchester 0%
- 13Luton 0%
- 14Storrington 0%
- 14Newcastle upon Tyne 0%
- 16Brighton 0%
- 17Hoo 0%
- 17Derby 0%
- 17Birminghamlow-cost sensors 0%
- 17Bexley 0%
- 21Wigan 0%
- 21Portsmouth 0%
- 21Leicester 0%
- 21Bristol 0%
- 25Sheringham 0%
- 25Seaford 0%
- 27York 0%
- 27Sunderland 0%
- 27Sheffield 0%
- 30Stoke-on-Trent 0%
- 31Preston 0%
- 31Brightlingsea 0%
- 33Royal Leamington Spa 0%
- 34Street 0%
- 34Andover 0%
- 36Reading 0%
- 36Cannock 0%
- 36Barnstaple 0%
- 39Liverpool 0%
- 39Irlam 0%
- 41Chesterfield 0%
- 42Burwell 0%
- 42Barnsley 0%
- 44Honiton 0%
- 45Oxford 0%
- 45Middlesbrough 0%
- 45High Peak 0%
- 48Westburylow-cost sensors 0%
- 49Saltash 0%
Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
All cities in the world, September 2025 · All cities in United Kingdom, September 2025 · England now
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SmogRank, most polluted cities in England, United Kingdom, PM2.5, September 2025, smogrank.com/gb/region/england/history/2025-09 (accessed 7 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.