SmogRank / World / United Kingdom / England / August 2025
Most polluted cities in England, United Kingdom, August 2025
55 cities in England, United Kingdom ranked by their average PM2.5 over the 31 days. Worst: Northampton at 8.7 µg/m³, #1,534 of 2,841 cities in the world. Cleanest: Middlesbrough at 3.9. 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%
- 2Speke 0%
- 3London 0%
- 4Manchester 0%
- 5Dartford 0%
- 6Leeds 0%
- 6Hayes 0%
- 8Hoo 0%
- 9Doncaster 0%
- 9Birminghamlow-cost sensors 0%
- 11Preston 0%
- 11Plymouth 0%
- 11Luton 0%
- 14Southampton 0%
- 14Newcastle upon Tyne 0%
- 16Nottingham 0%
- 16Leicester 0%
- 18Stoke-on-Trent 0%
- 18Kingston upon Hull 0%
- 18Irlam 0%
- 21Bristol 0%
- 22Sheffield 0%
- 22Royal Leamington Spa 0%
- 22Derby 0%
- 25Sheringham 0%
- 25Cannock 0%
- 27York 0%
- 27Liverpool 0%
- 27Cheadle Hulme 0%
- 27Bexley 0%
- 27Barnsley 0%
- 32Honiton 0%
- 33Street 0%
- 33Storrington 0%
- 33Portsmouth 0%
- 33Brighton 0%
- 33Barnstaple 0%
- 38Sunderland 0%
- 38Seaford 0%
- 38Norwich 0%
- 38Andover 0%
- 42Scunthorpe 0%
- 42Reading 0%
- 42Chesterfield 0%
- 42Brightlingsea 0%
- 46Halesworth 0%
- 47Burwell 0%
- 48Gillingham 0%
- 49Oxford 0%
- 49Newton Abbot 0%
- 51Westburylow-cost sensors 0%
- 52High Peak 0%
- 53Saltash 0%
- 54Warrington 0%
- 54Middlesbrough 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, August 2025 · All cities in United Kingdom, August 2025 · England now
Use this board
SmogRank, most polluted cities in England, United Kingdom, PM2.5, August 2025, smogrank.com/gb/region/england/history/2025-08 (accessed 6 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.