Official provisional monitoring data — subject to subsequent ratification.
England-wide AURN review meeting the predefined coverage criteria
National coverage criteria met. All nine regions, pollutant-level thresholds, the region-by-pollutant floor and time-basis assurance passed for this run.
- Network discovery: 172 active English AURN sites were catalogued; 143 currently configure at least one target pollutant.
- Coverage: 9 of 9 English regions, 142 reporting stations and 96.3% configured-stream completeness.
- Data status: 0 ratified pollutant-day observations and 9,544 provisional or as-supplied pollutant-day observations. Provisional results may change after ratification.
- Highest eligible station-period mean: Stoke-on-Trent A50 Roadside (West Midlands) at 24.83 µg/m³ for NO2.
- WHO-context pollutant-day observations: 137; counted directly from valid daily evidence and not a UK legal exceedance count.
Provisional-data and time-basis assurance
Parser assurance: PASS. Official annual files are interpreted as GMT hour ending; daily aggregation uses the printed source calendar date. The printed source date is retained for daily aggregation, and 24:00 is represented chronologically as next-day 00:00 UTC without moving the observation into the next daily mean.
24:00 evidence retained: 79,824 pollutant observations. Status flags: {'R': 1303704, 'P': 616763}.
R = ratified, P = provisional and P* = as supplied. Provisional and as-supplied values are clearly retained but must not be represented as final ratified statistics.
Pollutant coverage against configured streams
| Pollutant | Configured sites | Configured regions | Reporting sites | Reporting regions | Valid / expected pollutant-day observations | Completeness | Status |
|---|---|---|---|---|---|---|---|
| PM2.5 | 127 | 9 | 126 | 9 | 3,667 / 3,802 | 96.4% | reporting |
| PM10 | 108 | 9 | 106 | 9 | 3,112 / 3,232 | 96.3% | reporting |
| NO2 | 96 | 9 | 96 | 9 | 2,765 / 2,880 | 96.0% | reporting |
Region-by-pollutant completeness
| Region | Pollutant | Reporting sites | Valid / expected pollutant-day observations | Completeness | Gate status |
|---|---|---|---|---|---|
| North East | PM2.5 | 12 | 338 / 360 | 93.9% | meets national threshold |
| North East | PM10 | 10 | 288 / 300 | 96.0% | meets national threshold |
| North East | NO2 | 8 | 212 / 240 | 88.3% | meets national threshold |
| North West | PM2.5 | 18 | 527 / 540 | 97.6% | meets national threshold |
| North West | PM10 | 15 | 447 / 450 | 99.3% | meets national threshold |
| North West | NO2 | 17 | 504 / 510 | 98.8% | meets national threshold |
| Yorkshire and the Humber | PM2.5 | 19 | 547 / 570 | 96.0% | meets national threshold |
| Yorkshire and the Humber | PM10 | 17 | 480 / 510 | 94.1% | meets national threshold |
| Yorkshire and the Humber | NO2 | 15 | 437 / 450 | 97.1% | meets national threshold |
| East Midlands | PM2.5 | 12 | 352 / 382 | 92.1% | meets national threshold |
| East Midlands | PM10 | 10 | 298 / 322 | 92.5% | meets national threshold |
| East Midlands | NO2 | 9 | 253 / 270 | 93.7% | meets national threshold |
| West Midlands | PM2.5 | 19 | 565 / 570 | 99.1% | meets national threshold |
| West Midlands | PM10 | 18 | 535 / 540 | 99.1% | meets national threshold |
| West Midlands | NO2 | 16 | 462 / 480 | 96.2% | meets national threshold |
| East of England | PM2.5 | 7 | 182 / 210 | 86.7% | meets national threshold |
| East of England | PM10 | 5 | 142 / 150 | 94.7% | meets national threshold |
| East of England | NO2 | 4 | 116 / 120 | 96.7% | meets national threshold |
| London | PM2.5 | 7 | 210 / 210 | 100.0% | meets national threshold |
| London | PM10 | 5 | 150 / 180 | 83.3% | meets minimum floor with exception |
| London | NO2 | 4 | 120 / 120 | 100.0% | meets national threshold |
| South East | PM2.5 | 18 | 532 / 540 | 98.5% | meets national threshold |
| South East | PM10 | 16 | 472 / 480 | 98.3% | meets national threshold |
| South East | NO2 | 13 | 372 / 390 | 95.4% | meets national threshold |
| South West | PM2.5 | 14 | 414 / 420 | 98.6% | meets national threshold |
| South West | PM10 | 10 | 300 / 300 | 100.0% | meets national threshold |
| South West | NO2 | 10 | 289 / 300 | 96.3% | meets national threshold |
Coverage across all nine English regions
| English region | Active AURN sites | Target-pollutant sites | Reporting sites | Pollutants | Valid pollutant-day observations | Status |
|---|---|---|---|---|---|---|
| North East | 13 | 12 | 12 | NO2, PM10, PM2.5 | 838 | reporting |
| North West | 24 | 23 | 23 | NO2, PM10, PM2.5 | 1,478 | reporting |
| Yorkshire and the Humber | 21 | 20 | 20 | NO2, PM10, PM2.5 | 1,464 | reporting |
| East Midlands | 17 | 14 | 13 | NO2, PM10, PM2.5 | 903 | reporting |
| West Midlands | 22 | 22 | 22 | NO2, PM10, PM2.5 | 1,562 | reporting |
| East of England | 15 | 8 | 8 | NO2, PM10, PM2.5 | 440 | reporting |
| London | 17 | 7 | 7 | NO2, PM10, PM2.5 | 480 | reporting |
| South East | 24 | 20 | 20 | NO2, PM10, PM2.5 | 1,376 | reporting |
| South West | 19 | 17 | 17 | NO2, PM10, PM2.5 | 1,003 | reporting |
Scientific boundary
This review automatically discovers the active English AURN network and analyses available official hourly data. It is not population-weighted, does not estimate personal exposure and does not establish source contribution, causation, legal compliance or health impact. Invalid daily means are retained for transparency but are not classified against WHO contextual references.
Eligible regional PM2.5 pattern
Only regions meeting the multi-station eligibility rule are shown; values are µg/m³.
PM2.5 station comparison
Data are provisional unless the station-day is shown as ratified. Values may change after UK-AIR ratification.
| Station | Region | Setting | Valid days | Ratified days | Provisional/as supplied | 30-day mean | Daily p95 | WHO-context days |
|---|---|---|---|---|---|---|---|---|
| Carlisle Morton A595 | North West | Urban Traffic | 30 | 0 | 30 | 8.08 | 13.32 | 0 |
| Manchester Piccadilly | North West | Urban Background | 28 | 0 | 28 | 7.15 | 14.14 | 2 |
| Newcastle Centre | North East | Urban Background | 30 | 0 | 30 | 6.80 | 10.76 | 0 |
| Maidstone Upper Stone Street | South East | Urban Traffic | 30 | 0 | 30 | 6.75 | 12.25 | 0 |
| Leeds Headingley Kerbside | Yorkshire and the Humber | Urban Traffic | 27 | 0 | 27 | 6.59 | 10.20 | 0 |
| Liverpool Speke | North West | Urban Industrial | 30 | 0 | 30 | 6.57 | 11.47 | 0 |
| Hull Holderness Road | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 6.51 | 13.02 | 1 |
| York Fishergate | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 6.50 | 12.05 | 1 |
| Cheltenham A40 Gloucester Road | South West | Urban Traffic | 27 | 0 | 27 | 6.46 | 12.37 | 0 |
| Rotherham East Dene | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 6.46 | 14.37 | 2 |
| Blackpool Whitegate Drive | North West | Urban Traffic | 30 | 0 | 30 | 6.41 | 12.47 | 1 |
| Sheffield Barnsley Road | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 6.39 | 12.67 | 1 |
| Worthing A27 Roadside | South East | Urban Traffic | 30 | 0 | 30 | 6.18 | 8.11 | 0 |
| Scunthorpe Town | Yorkshire and the Humber | Urban Industrial | 30 | 0 | 30 | 6.13 | 12.27 | 0 |
| Bradford Shipley Airedale Road | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 6.10 | 12.01 | 1 |
| Wigan Centre | North West | Urban Background | 30 | 0 | 30 | 6.03 | 13.48 | 2 |
| Northampton Spring Park | East Midlands | Urban Background | 24 | 0 | 24 | 5.89 | 10.99 | 0 |
| Bradford West Park | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 5.87 | 12.53 | 1 |
| Hartlepool St Abbs Walk | North East | Urban Background | 30 | 0 | 30 | 5.85 | 12.32 | 0 |
| Stockton-on-Tees Eaglescliffe | North East | Urban Traffic | 22 | 0 | 22 | 5.80 | 9.00 | 0 |
| Blackpool Marton | North West | Urban Background | 30 | 0 | 30 | 5.79 | 12.09 | 1 |
| York Bootham | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 5.69 | 10.15 | 0 |
| Stockton-on-Tees A1305 Roadside | North East | Urban Traffic | 23 | 0 | 23 | 5.61 | 10.50 | 0 |
| Salford Eccles | North West | Urban Background | 30 | 0 | 30 | 5.59 | 12.17 | 0 |
| Rochdale Belfield | North West | Urban Background | 30 | 0 | 30 | 5.48 | 13.37 | 0 |
| Preston | North West | Urban Background | 30 | 0 | 30 | 5.45 | 11.36 | 0 |
| Hull Freetown | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 5.43 | 9.78 | 0 |
| Sheffield Devonshire Green | Yorkshire and the Humber | Urban Background | 25 | 0 | 25 | 5.37 | 13.71 | 1 |
| Leeds Centre | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 5.36 | 10.92 | 0 |
| Tameside A635 Manchester Road | North West | Urban Traffic | 25 | 0 | 25 | 5.35 | 11.74 | 0 |
| Wakefield Alverthorpe | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 5.35 | 11.84 | 0 |
| Leicester A594 Roadside | East Midlands | Urban Traffic | 29 | 0 | 29 | 5.34 | 10.62 | 0 |
| Redcar Milford Walk | North East | Urban Background | 30 | 0 | 30 | 5.33 | 11.97 | 0 |
| Nottingham Kenmore Gardens | East Midlands | Urban Background | 30 | 0 | 30 | 5.29 | 10.95 | 0 |
| Blackburn Audley Park | North West | Urban Background | 30 | 0 | 30 | 5.29 | 11.83 | 0 |
| Doncaster A630 Cleveland Street | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 5.26 | 10.65 | 1 |
| London A406 N Circular | London | Urban Traffic | 30 | 0 | 30 | 5.14 | 9.10 | 0 |
| Middlewich St Michael's Way | North West | Urban Traffic | 30 | 0 | 30 | 5.13 | 11.40 | 0 |
| Birkenhead Borough Road | North West | Urban Traffic | 30 | 0 | 30 | 5.12 | 10.38 | 0 |
| Stoke-on-Trent A50 Roadside | West Midlands | Urban Traffic | 30 | 0 | 30 | 5.11 | 12.09 | 0 |
| Dewsbury Ashworth Grange | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 5.11 | 11.26 | 0 |
| Oldbury Birmingham Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 5.02 | 11.07 | 0 |
| Sheffield Tinsley | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 5.02 | 10.73 | 1 |
| Derby St Alkmund's Way | East Midlands | Urban Traffic | 30 | 0 | 30 | 5.01 | 10.10 | 0 |
| Birmingham A4540 Roadside | West Midlands | Urban Traffic | 30 | 0 | 30 | 5.00 | 9.65 | 0 |
| Nottingham Western Boulevard | East Midlands | Urban Traffic | 30 | 0 | 30 | 4.95 | 10.37 | 0 |
| Warrington St. Peter's Park | North West | Urban Background | 24 | 0 | 24 | 4.93 | 11.00 | 0 |
| Plymouth Centre | South West | Urban Background | 30 | 0 | 30 | 4.93 | 9.28 | 0 |
| Liverpool Thirlmere Park | North West | Urban Background | 30 | 0 | 30 | 4.90 | 10.59 | 0 |
| Walsall Caldmore | West Midlands | Urban Background | 30 | 0 | 30 | 4.90 | 11.19 | 0 |
| Darlington Firthmoor | North East | Urban Background | 30 | 0 | 30 | 4.86 | 9.90 | 1 |
| Harrogate Woodlands | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 4.86 | 10.28 | 0 |
| Sunderland Silksworth | North East | Urban Background | 30 | 0 | 30 | 4.82 | 10.01 | 0 |
| Bournemouth Bourne Valley | South West | Urban Background | 30 | 0 | 30 | 4.80 | 7.79 | 0 |
| Southampton Centre | South East | Urban Background | 30 | 0 | 30 | 4.78 | 8.05 | 0 |
| Immingham Woodlands Avenue | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 4.78 | 10.07 | 0 |
| Burton-on-Trent Horninglow | West Midlands | Urban Background | 28 | 0 | 28 | 4.75 | 10.75 | 0 |
| Mansfield Ladybrook | East Midlands | Urban Background | 30 | 0 | 30 | 4.72 | 10.16 | 0 |
| Chatham Roadside | South East | Urban Traffic | 24 | 0 | 24 | 4.72 | 12.62 | 1 |
| Manchester Sharston | North West | Suburban Industrial | 30 | 0 | 30 | 4.70 | 10.47 | 0 |
| Wirral Tranmere | North West | Urban Background | 30 | 0 | 30 | 4.67 | 9.85 | 0 |
| Worthing East Ten Acres | South East | Urban Background | 30 | 0 | 30 | 4.65 | 7.12 | 0 |
| Stoke-on-Trent Centre | West Midlands | Urban Background | 30 | 0 | 30 | 4.65 | 11.07 | 0 |
| Chesterfield Roadside | East Midlands | Urban Traffic | 30 | 0 | 30 | 4.64 | 12.74 | 0 |
| London Hillingdon | London | Urban Background | 30 | 0 | 30 | 4.64 | 8.16 | 0 |
| Bournemouth | South West | Urban Background | 27 | 0 | 27 | 4.64 | 7.41 | 0 |
| Bristol Temple Way | South West | Urban Traffic | 30 | 0 | 30 | 4.63 | 8.43 | 0 |
| North Shields Chirton | North East | Urban Background | 30 | 0 | 30 | 4.62 | 9.39 | 0 |
| Wolverhampton East Park | West Midlands | Urban Background | 30 | 0 | 30 | 4.62 | 10.65 | 0 |
| Southend-on-Sea | East of England | Urban Background | 30 | 0 | 30 | 4.60 | 8.57 | 1 |
| London Westminster | London | Urban Background | 30 | 0 | 30 | 4.60 | 7.19 | 0 |
| Newcastle Cradlewell Roadside | North East | Urban Traffic | 30 | 0 | 30 | 4.59 | 8.74 | 0 |
| Bristol St Paul's | South West | Urban Background | 30 | 0 | 30 | 4.58 | 8.12 | 0 |
| Farnborough Cherrywood | South East | Urban Background | 30 | 0 | 30 | 4.55 | 10.39 | 0 |
| Gloucester Tredworth | South West | Urban Background | 30 | 0 | 30 | 4.55 | 9.31 | 0 |
| Luton A505 Roadside | East of England | Urban Traffic | 30 | 0 | 30 | 4.50 | 9.69 | 0 |
| Crewe Coppenhall | North West | Urban Background | 30 | 0 | 30 | 4.50 | 10.40 | 0 |
| Southend Shoeburyness | East of England | Urban Background | 22 | 0 | 22 | 4.49 | 7.59 | 0 |
| Nottingham Bilborough | East Midlands | Urban Background | 30 | 0 | 30 | 4.47 | 9.81 | 0 |
| Ashington Centre | North East | Urban Background | 30 | 0 | 30 | 4.47 | 9.33 | 0 |
| Sunderland Wessington Way | North East | Urban Traffic | 30 | 0 | 30 | 4.46 | 9.10 | 0 |
| Brighton Preston Park | South East | Urban Background | 30 | 0 | 30 | 4.45 | 6.31 | 0 |
| Bedworth Collycroft | West Midlands | Urban Background | 30 | 0 | 30 | 4.45 | 10.00 | 0 |
| Loughborough Thorpe Acre | East Midlands | Urban Background | 30 | 0 | 30 | 4.43 | 9.31 | 0 |
| Birmingham Hall Green | West Midlands | Urban Background | 30 | 0 | 30 | 4.41 | 9.70 | 0 |
| Southampton A33 | South East | Urban Traffic | 30 | 0 | 30 | 4.40 | 7.11 | 0 |
| Storrington Roadside | South East | Urban Traffic | 30 | 0 | 30 | 4.40 | 6.63 | 0 |
| Derby Stockbrook Park | East Midlands | Urban Background | 30 | 0 | 30 | 4.38 | 9.53 | 0 |
| Slough Windmill Bath Road | South East | Urban Traffic | 30 | 0 | 30 | 4.38 | 7.99 | 0 |
| Coventry Binley Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 4.38 | 9.20 | 0 |
| London Bloomsbury | London | Urban Background | 30 | 0 | 30 | 4.37 | 7.09 | 0 |
| Portsmouth Anglesea Road | South East | Urban Traffic | 28 | 0 | 28 | 4.37 | 7.03 | 0 |
| Peterborough Garton End | East of England | Urban Background | 30 | 0 | 30 | 4.36 | 9.65 | 0 |
| Eastbourne | South East | Urban Background | 30 | 0 | 30 | 4.35 | 6.97 | 0 |
| London Norbury Manor School | London | Urban Background | 30 | 0 | 30 | 4.33 | 7.41 | 1 |
| Norwich Lakenfields | East of England | Urban Background | 30 | 0 | 30 | 4.29 | 8.17 | 0 |
| Chesterfield Loundsley Green | East Midlands | Urban Background | 30 | 0 | 30 | 4.28 | 10.92 | 0 |
| Cannock A5190 Roadside | West Midlands | Urban Traffic | 30 | 0 | 30 | 4.26 | 10.64 | 0 |
| Leamington Spa | West Midlands | Urban Background | 30 | 0 | 30 | 4.26 | 9.14 | 0 |
| Milton Keynes Civic Centre | South East | Urban Background | 30 | 0 | 30 | 4.25 | 9.77 | 1 |
| Birmingham Ladywood | West Midlands | Urban Background | 27 | 0 | 27 | 4.20 | 9.93 | 0 |
| Cambridge King's Hedges | East of England | Urban Background | 30 | 0 | 30 | 4.19 | 8.64 | 0 |
| Bridgwater A372 Westonzoyland | South West | Urban Traffic | 30 | 0 | 30 | 4.18 | 7.26 | 0 |
| Worcester Tolladine | West Midlands | Urban Background | 30 | 0 | 30 | 4.18 | 8.30 | 0 |
| Birmingham University | West Midlands | Urban Background | 30 | 0 | 30 | 4.13 | 9.50 | 0 |
| Portsmouth | South East | Urban Background | 30 | 0 | 30 | 4.12 | 6.33 | 0 |
| Coventry Allesley | West Midlands | Urban Background | 30 | 0 | 30 | 4.12 | 9.16 | 0 |
| Leicester University | East Midlands | Urban Background | 29 | 0 | 29 | 4.10 | 9.01 | 0 |
| Shrewsbury Underdale | West Midlands | Urban Background | 30 | 0 | 30 | 4.04 | 10.34 | 0 |
| London Teddington Bushy Park | London | Urban Background | 30 | 0 | 30 | 4.01 | 6.98 | 0 |
| Barnstaple A39 | South West | Urban Traffic | 30 | 0 | 30 | 3.96 | 6.79 | 0 |
| Reading Rose Kiln Lane | South East | Urban Traffic | 30 | 0 | 30 | 3.94 | 8.12 | 0 |
| Aylesbury A4157 | South East | Urban Traffic | 30 | 0 | 30 | 3.93 | 8.24 | 0 |
| Leamington Spa Rugby Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 3.92 | 8.76 | 0 |
| Reading New Town | South East | Urban Background | 30 | 0 | 30 | 3.91 | 8.09 | 0 |
| Bristol Patchway | South West | Urban Background | 30 | 0 | 30 | 3.89 | 7.48 | 0 |
| Telford Hollinswood | West Midlands | Urban Background | 30 | 0 | 30 | 3.88 | 8.80 | 0 |
| Swindon Walcot | South West | Urban Background | 30 | 0 | 30 | 3.84 | 7.91 | 0 |
| Honiton | South West | Urban Background | 30 | 0 | 30 | 3.78 | 7.43 | 0 |
| London Harlington | London | Urban Industrial | 30 | 0 | 30 | 3.70 | 6.44 | 0 |
| Christchurch Barrack Road | South West | Urban Traffic | 30 | 0 | 30 | 3.68 | 8.23 | 0 |
| Barnsley Gawber | Yorkshire and the Humber | Urban Background | 15 | 0 | 15 | 3.49 | 5.52 | 0 |
| Middlesbrough | North East | Urban Background | 23 | 0 | 23 | 3.38 | 7.95 | 0 |
| Oxford St Ebbes | South East | Urban Background | 30 | 0 | 30 | 3.37 | 7.18 | 0 |
| Saltash Callington Road | South West | Urban Traffic | 30 | 0 | 30 | 2.96 | 8.83 | 0 |
WHO 2021 24-hour AQG of 15 µg/m³ is contextual, not a UK legal threshold.
Eligible regional PM10 pattern
Only regions meeting the multi-station eligibility rule are shown; values are µg/m³.
PM10 station comparison
Data are provisional unless the station-day is shown as ratified. Values may change after UK-AIR ratification.
| Station | Region | Setting | Valid days | Ratified days | Provisional/as supplied | 30-day mean | Daily p95 | WHO-context days |
|---|---|---|---|---|---|---|---|---|
| Leeds Headingley Kerbside | Yorkshire and the Humber | Urban Traffic | 27 | 0 | 27 | 14.97 | 24.04 | 0 |
| Chatham Roadside | South East | Urban Traffic | 24 | 0 | 24 | 14.20 | 22.44 | 0 |
| Manchester Piccadilly | North West | Urban Background | 28 | 0 | 28 | 14.09 | 23.25 | 0 |
| Maidstone Upper Stone Street | South East | Urban Traffic | 30 | 0 | 30 | 13.99 | 22.12 | 0 |
| Reading London Road | South East | Urban Traffic | 30 | 0 | 30 | 13.88 | 20.28 | 0 |
| Scunthorpe Town | Yorkshire and the Humber | Urban Industrial | 23 | 0 | 23 | 13.19 | 26.72 | 0 |
| St Helens Linkway | North West | Urban Traffic | 29 | 0 | 29 | 13.08 | 18.77 | 0 |
| London Hillingdon | London | Urban Background | 30 | 0 | 30 | 13.07 | 22.55 | 0 |
| York Fishergate | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 12.93 | 19.34 | 1 |
| Bristol St Paul's | South West | Urban Background | 30 | 0 | 30 | 12.68 | 20.37 | 0 |
| Hull Holderness Road | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 12.65 | 21.66 | 0 |
| Liverpool Speke | North West | Urban Industrial | 30 | 0 | 30 | 12.06 | 19.41 | 0 |
| Hartlepool St Abbs Walk | North East | Urban Background | 30 | 0 | 30 | 11.71 | 24.59 | 0 |
| Saltash Callington Road | South West | Urban Traffic | 30 | 0 | 30 | 11.59 | 20.32 | 0 |
| Wigan Centre | North West | Urban Background | 30 | 0 | 30 | 11.27 | 20.83 | 0 |
| Leicester A594 Roadside | East Midlands | Urban Traffic | 29 | 0 | 29 | 11.25 | 18.04 | 0 |
| Birmingham A4540 Roadside | West Midlands | Urban Traffic | 30 | 0 | 30 | 11.21 | 17.90 | 0 |
| Rotherham East Dene | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 11.17 | 22.10 | 0 |
| Bury Whitefield Roadside | North West | Urban Traffic | 30 | 0 | 30 | 11.14 | 15.19 | 0 |
| Bradford Shipley Airedale Road | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 11.10 | 20.42 | 0 |
| Salford Eccles | North West | Urban Background | 30 | 0 | 30 | 10.72 | 18.04 | 0 |
| Blackpool Marton | North West | Urban Background | 30 | 0 | 30 | 10.71 | 17.70 | 0 |
| Bradford West Park | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 10.69 | 21.06 | 0 |
| Sheffield Tinsley | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 10.66 | 21.64 | 0 |
| York Bootham | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 10.66 | 15.99 | 0 |
| Bournemouth Bourne Valley | South West | Urban Background | 30 | 0 | 30 | 10.64 | 20.49 | 0 |
| Newcastle Centre | North East | Urban Background | 30 | 0 | 30 | 10.57 | 19.72 | 0 |
| Hull Freetown | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 10.55 | 16.68 | 0 |
| Redcar Milford Walk | North East | Urban Background | 30 | 0 | 30 | 10.48 | 20.16 | 0 |
| Oldbury Birmingham Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 10.44 | 20.17 | 0 |
| Plymouth Centre | South West | Urban Background | 30 | 0 | 30 | 10.27 | 17.25 | 0 |
| Middlesbrough | North East | Urban Background | 23 | 0 | 23 | 10.25 | 15.75 | 0 |
| London Bloomsbury | London | Urban Background | 30 | 0 | 30 | 9.97 | 18.28 | 0 |
| Nottingham Western Boulevard | East Midlands | Urban Traffic | 30 | 0 | 30 | 9.92 | 15.48 | 0 |
| Slough Windmill Bath Road | South East | Urban Traffic | 30 | 0 | 30 | 9.91 | 17.34 | 0 |
| Chesterfield Roadside | East Midlands | Urban Traffic | 30 | 0 | 30 | 9.87 | 21.92 | 0 |
| Preston | North West | Urban Background | 30 | 0 | 30 | 9.86 | 17.25 | 0 |
| Wakefield Alverthorpe | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 9.86 | 18.81 | 0 |
| Nottingham Kenmore Gardens | East Midlands | Urban Background | 30 | 0 | 30 | 9.81 | 15.42 | 0 |
| Southampton A33 | South East | Urban Traffic | 30 | 0 | 30 | 9.77 | 14.95 | 0 |
| Southampton Centre | South East | Urban Background | 30 | 0 | 30 | 9.72 | 17.38 | 0 |
| Worthing East Ten Acres | South East | Urban Background | 30 | 0 | 30 | 9.71 | 15.19 | 0 |
| Stoke-on-Trent A50 Roadside | West Midlands | Urban Traffic | 30 | 0 | 30 | 9.68 | 16.85 | 0 |
| Bristol Temple Way | South West | Urban Traffic | 30 | 0 | 30 | 9.67 | 17.30 | 0 |
| Sheffield Devonshire Green | Yorkshire and the Humber | Urban Background | 25 | 0 | 25 | 9.61 | 23.94 | 0 |
| Leeds Centre | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 9.53 | 17.89 | 0 |
| Rochdale Belfield | North West | Urban Background | 30 | 0 | 30 | 9.41 | 17.92 | 0 |
| Dewsbury Ashworth Grange | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 9.39 | 18.69 | 0 |
| Storrington Roadside | South East | Urban Traffic | 30 | 0 | 30 | 9.32 | 13.79 | 0 |
| Immingham Woodlands Avenue | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 9.28 | 18.05 | 0 |
| Blackburn Audley Park | North West | Urban Background | 30 | 0 | 30 | 9.18 | 16.67 | 0 |
| Manchester Sharston | North West | Suburban Industrial | 30 | 0 | 30 | 9.18 | 15.96 | 0 |
| Southend-on-Sea | East of England | Urban Background | 30 | 0 | 30 | 9.13 | 16.23 | 0 |
| Carlisle Morton A595 | North West | Urban Traffic | 30 | 0 | 30 | 9.08 | 17.72 | 0 |
| Walsall Caldmore | West Midlands | Urban Background | 30 | 0 | 30 | 9.08 | 15.88 | 0 |
| Barnstaple A39 | South West | Urban Traffic | 30 | 0 | 30 | 9.07 | 13.29 | 0 |
| Portsmouth Anglesea Road | South East | Urban Traffic | 28 | 0 | 28 | 9.01 | 14.72 | 0 |
| Portsmouth | South East | Urban Background | 30 | 0 | 30 | 8.97 | 15.08 | 0 |
| Stockton-on-Tees Eaglescliffe | North East | Urban Traffic | 25 | 0 | 25 | 8.96 | 12.92 | 0 |
| Brighton Preston Park | South East | Urban Background | 30 | 0 | 30 | 8.96 | 13.61 | 0 |
| Sunderland Silksworth | North East | Urban Background | 30 | 0 | 30 | 8.91 | 17.22 | 0 |
| Coventry Binley Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 8.90 | 16.34 | 0 |
| Liverpool Thirlmere Park | North West | Urban Background | 30 | 0 | 30 | 8.89 | 15.81 | 0 |
| Nottingham Bilborough | East Midlands | Urban Background | 30 | 0 | 30 | 8.81 | 15.98 | 0 |
| Burton-on-Trent Horninglow | West Midlands | Urban Background | 28 | 0 | 28 | 8.81 | 15.06 | 0 |
| Gloucester Tredworth | South West | Urban Background | 30 | 0 | 30 | 8.75 | 16.13 | 0 |
| London Teddington Bushy Park | London | Urban Background | 30 | 0 | 30 | 8.70 | 14.67 | 0 |
| Bedworth Collycroft | West Midlands | Urban Background | 30 | 0 | 30 | 8.70 | 16.53 | 0 |
| Wolverhampton East Park | West Midlands | Urban Background | 30 | 0 | 30 | 8.67 | 15.43 | 0 |
| Stoke-on-Trent Centre | West Midlands | Urban Background | 30 | 0 | 30 | 8.65 | 15.04 | 0 |
| Newcastle Cradlewell Roadside | North East | Urban Traffic | 30 | 0 | 30 | 8.58 | 15.65 | 0 |
| Eastbourne | South East | Urban Background | 30 | 0 | 30 | 8.55 | 13.40 | 0 |
| Milton Keynes Civic Centre | South East | Urban Background | 30 | 0 | 30 | 8.55 | 18.98 | 0 |
| Southend Shoeburyness | East of England | Urban Background | 22 | 0 | 22 | 8.50 | 13.42 | 0 |
| Wirral Tranmere | North West | Urban Background | 30 | 0 | 30 | 8.50 | 15.18 | 0 |
| Mansfield Ladybrook | East Midlands | Urban Background | 30 | 0 | 30 | 8.47 | 14.37 | 0 |
| Coventry Allesley | West Midlands | Urban Background | 30 | 0 | 30 | 8.47 | 15.27 | 0 |
| Bristol Patchway | South West | Urban Background | 30 | 0 | 30 | 8.42 | 13.60 | 0 |
| London Harlington | London | Urban Industrial | 30 | 0 | 30 | 8.40 | 14.20 | 0 |
| Leamington Spa | West Midlands | Urban Background | 30 | 0 | 30 | 8.38 | 16.35 | 0 |
| Birmingham Hall Green | West Midlands | Urban Background | 30 | 0 | 30 | 8.34 | 16.27 | 0 |
| Cambridge King's Hedges | East of England | Urban Background | 30 | 0 | 30 | 8.33 | 16.01 | 0 |
| Crewe Coppenhall | North West | Urban Background | 30 | 0 | 30 | 8.32 | 14.21 | 0 |
| London Norbury Manor School | London | Urban Background | 30 | 0 | 30 | 8.31 | 14.43 | 0 |
| Farnborough Cherrywood | South East | Urban Background | 30 | 0 | 30 | 8.31 | 16.66 | 0 |
| Darlington Firthmoor | North East | Urban Background | 30 | 0 | 30 | 8.30 | 15.09 | 0 |
| Peterborough Garton End | East of England | Urban Background | 30 | 0 | 30 | 8.29 | 14.29 | 0 |
| Harrogate Woodlands | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 8.22 | 15.83 | 0 |
| Worcester Tolladine | West Midlands | Urban Background | 30 | 0 | 30 | 8.20 | 16.60 | 0 |
| Swindon Walcot | South West | Urban Background | 30 | 0 | 30 | 8.19 | 15.84 | 0 |
| Barnsley Gawber | Yorkshire and the Humber | Urban Background | 15 | 0 | 15 | 8.19 | 14.33 | 0 |
| Derby Stockbrook Park | East Midlands | Urban Background | 30 | 0 | 30 | 8.16 | 13.76 | 0 |
| Ashington Centre | North East | Urban Background | 30 | 0 | 30 | 8.11 | 16.53 | 0 |
| Shrewsbury Underdale | West Midlands | Urban Background | 30 | 0 | 30 | 8.10 | 17.19 | 0 |
| Chesterfield Loundsley Green | East Midlands | Urban Background | 30 | 0 | 30 | 8.09 | 16.31 | 0 |
| Reading New Town | South East | Urban Background | 30 | 0 | 30 | 8.04 | 14.04 | 0 |
| Birmingham University | West Midlands | Urban Background | 30 | 0 | 30 | 8.04 | 16.67 | 0 |
| North Shields Chirton | North East | Urban Background | 30 | 0 | 30 | 7.96 | 16.06 | 0 |
| Birmingham Ladywood | West Midlands | Urban Background | 27 | 0 | 27 | 7.95 | 16.32 | 0 |
| Loughborough Thorpe Acre | East Midlands | Urban Background | 30 | 0 | 30 | 7.93 | 12.66 | 0 |
| Norwich Lakenfields | East of England | Urban Background | 30 | 0 | 30 | 7.82 | 13.31 | 0 |
| Telford Hollinswood | West Midlands | Urban Background | 30 | 0 | 30 | 7.73 | 13.55 | 0 |
| Leamington Spa Rugby Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 7.54 | 14.54 | 0 |
| Honiton | South West | Urban Background | 30 | 0 | 30 | 7.23 | 13.41 | 0 |
| Leicester University | East Midlands | Urban Background | 29 | 0 | 29 | 7.14 | 13.00 | 0 |
| Oxford St Ebbes | South East | Urban Background | 30 | 0 | 30 | 7.13 | 13.93 | 0 |
WHO 2021 24-hour AQG of 45 µg/m³ is contextual, not a UK legal threshold.
Eligible regional NO2 pattern
Only regions meeting the multi-station eligibility rule are shown; values are µg/m³.
NO2 station comparison
Data are provisional unless the station-day is shown as ratified. Values may change after UK-AIR ratification.
| Station | Region | Setting | Valid days | Ratified days | Provisional/as supplied | 30-day mean | Daily p95 | WHO-context days |
|---|---|---|---|---|---|---|---|---|
| Stoke-on-Trent A50 Roadside | West Midlands | Urban Traffic | 30 | 0 | 30 | 24.83 | 33.26 | 13 |
| Sheffield Barnsley Road | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 24.67 | 35.48 | 12 |
| Birmingham A4540 Roadside | West Midlands | Urban Traffic | 29 | 0 | 29 | 23.14 | 29.97 | 10 |
| Leicester A594 Roadside | East Midlands | Urban Traffic | 29 | 0 | 29 | 22.49 | 32.25 | 11 |
| Newcastle Cradlewell Roadside | North East | Urban Traffic | 22 | 0 | 22 | 20.89 | 29.91 | 5 |
| Luton A505 Roadside | East of England | Urban Traffic | 29 | 0 | 29 | 20.41 | 32.34 | 11 |
| Bradford Mayo Avenue | Yorkshire and the Humber | Urban Traffic | 29 | 0 | 29 | 20.28 | 35.98 | 8 |
| Southampton A33 | South East | Urban Traffic | 29 | 0 | 29 | 20.23 | 33.98 | 7 |
| Oldbury Birmingham Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 19.21 | 26.26 | 3 |
| London Hillingdon | London | Urban Background | 30 | 0 | 30 | 19.14 | 33.19 | 4 |
| Widnes Milton Road | North West | Urban Traffic | 30 | 0 | 30 | 18.45 | 27.85 | 4 |
| Coventry Binley Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 18.00 | 24.55 | 1 |
| St Helens Linkway | North West | Urban Traffic | 29 | 0 | 29 | 17.88 | 25.52 | 3 |
| Derby St Alkmund's Way | East Midlands | Urban Traffic | 28 | 0 | 28 | 17.87 | 23.73 | 0 |
| London Harlington | London | Urban Industrial | 30 | 0 | 30 | 17.78 | 30.15 | 7 |
| Lincoln Canwick Road | East Midlands | Urban Traffic | 23 | 0 | 23 | 17.22 | 26.46 | 3 |
| Doncaster A630 Cleveland Street | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 16.93 | 23.26 | 1 |
| Bristol Temple Way | South West | Urban Traffic | 25 | 0 | 25 | 16.83 | 27.54 | 4 |
| Cambridge Roadside | East of England | Urban Traffic | 29 | 0 | 29 | 16.63 | 23.07 | 0 |
| Chatham Roadside | South East | Urban Traffic | 24 | 0 | 24 | 16.28 | 21.07 | 0 |
| Shaw Crompton Way | North West | Urban Traffic | 30 | 0 | 30 | 16.20 | 24.71 | 0 |
| Sheffield Tinsley | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 15.83 | 21.62 | 0 |
| Manchester Piccadilly | North West | Urban Background | 30 | 0 | 30 | 15.69 | 22.01 | 1 |
| Nottingham Western Boulevard | East Midlands | Urban Traffic | 30 | 0 | 30 | 15.63 | 23.32 | 1 |
| Southampton Centre | South East | Urban Background | 28 | 0 | 28 | 15.40 | 23.11 | 0 |
| Worthing A27 Roadside | South East | Urban Traffic | 30 | 0 | 30 | 15.40 | 20.51 | 0 |
| Bath A4 Roadside | South West | Urban Traffic | 30 | 0 | 30 | 15.25 | 23.71 | 1 |
| Hull Holderness Road | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 15.21 | 23.14 | 0 |
| Leeds Centre | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 14.70 | 19.49 | 0 |
| London Bloomsbury | London | Urban Background | 30 | 0 | 30 | 14.42 | 24.78 | 1 |
| Exeter Roadside | South West | Urban Traffic | 27 | 0 | 27 | 13.81 | 20.95 | 0 |
| Portsmouth Anglesea Road | South East | Urban Traffic | 30 | 0 | 30 | 13.45 | 20.16 | 0 |
| Stoke-on-Trent Centre | West Midlands | Urban Background | 28 | 0 | 28 | 13.39 | 19.99 | 0 |
| Hull Freetown | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 13.11 | 20.17 | 0 |
| Leicester University | East Midlands | Urban Background | 29 | 0 | 29 | 12.92 | 20.36 | 0 |
| Salford Eccles | North West | Urban Background | 30 | 0 | 30 | 12.80 | 18.64 | 1 |
| Blackburn Accrington Road | North West | Urban Traffic | 30 | 0 | 30 | 12.74 | 17.94 | 0 |
| Reading London Road | South East | Urban Traffic | 30 | 0 | 30 | 12.39 | 19.42 | 0 |
| Oxford Centre Roadside | South East | Urban Traffic | 30 | 0 | 30 | 12.23 | 21.87 | 1 |
| Storrington Roadside | South East | Urban Traffic | 28 | 0 | 28 | 11.94 | 17.31 | 0 |
| Bury Whitefield Roadside | North West | Urban Traffic | 30 | 0 | 30 | 11.56 | 15.81 | 0 |
| Newcastle Centre | North East | Urban Background | 28 | 0 | 28 | 11.28 | 16.04 | 0 |
| York Fishergate | Yorkshire and the Humber | Urban Traffic | 30 | 0 | 30 | 11.23 | 16.91 | 0 |
| Burton-on-Trent Horninglow | West Midlands | Urban Background | 28 | 0 | 28 | 11.21 | 15.94 | 0 |
| Plymouth Tavistock Road | South West | Urban Traffic | 30 | 0 | 30 | 10.60 | 17.87 | 0 |
| Nottingham Kenmore Gardens | East Midlands | Urban Background | 28 | 0 | 28 | 10.40 | 15.23 | 0 |
| Dewsbury Ashworth Grange | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 10.18 | 17.21 | 0 |
| Leeds Headingley Kerbside | Yorkshire and the Humber | Urban Traffic | 20 | 0 | 20 | 10.17 | 14.97 | 0 |
| West Bromwich Kenrick Park | West Midlands | Urban Background | 28 | 0 | 28 | 10.15 | 13.84 | 0 |
| London Westminster | London | Urban Background | 30 | 0 | 30 | 9.97 | 16.75 | 0 |
| Liverpool Speke | North West | Urban Industrial | 30 | 0 | 30 | 9.86 | 16.69 | 0 |
| Preston | North West | Urban Background | 30 | 0 | 30 | 9.85 | 13.70 | 0 |
| Warrington St. Peter's Park | North West | Urban Background | 28 | 0 | 28 | 9.85 | 15.11 | 0 |
| Sheffield Devonshire Green | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 9.76 | 15.84 | 0 |
| Manchester Sharston | North West | Suburban Industrial | 30 | 0 | 30 | 9.74 | 14.05 | 0 |
| Stockton-on-Tees A1305 Roadside | North East | Urban Traffic | 28 | 0 | 28 | 9.45 | 19.78 | 1 |
| Portsmouth | South East | Urban Background | 30 | 0 | 30 | 9.11 | 15.60 | 0 |
| Cannock A5190 Roadside | West Midlands | Urban Traffic | 30 | 0 | 30 | 9.09 | 13.82 | 0 |
| Wigan Centre | North West | Urban Background | 30 | 0 | 30 | 9.07 | 15.44 | 0 |
| Chesterfield Roadside | East Midlands | Urban Traffic | 28 | 0 | 28 | 8.97 | 14.36 | 0 |
| Birkenhead Borough Road | North West | Urban Traffic | 30 | 0 | 30 | 8.95 | 15.08 | 1 |
| Birmingham Ladywood | West Midlands | Urban Background | 30 | 0 | 30 | 8.84 | 15.25 | 0 |
| Bristol St Paul's | South West | Urban Background | 28 | 0 | 28 | 8.72 | 13.86 | 0 |
| Sunderland Wessington Way | North East | Urban Traffic | 29 | 0 | 29 | 8.70 | 14.40 | 0 |
| Plymouth Centre | South West | Urban Background | 30 | 0 | 30 | 8.39 | 14.87 | 0 |
| Scunthorpe Town | Yorkshire and the Humber | Urban Industrial | 28 | 0 | 28 | 8.35 | 11.20 | 0 |
| Middlesbrough | North East | Urban Background | 29 | 0 | 29 | 8.29 | 14.09 | 0 |
| Christchurch Barrack Road | South West | Urban Traffic | 30 | 0 | 30 | 8.16 | 16.08 | 0 |
| Birmingham Hall Green | West Midlands | Urban Background | 28 | 0 | 28 | 8.03 | 14.05 | 0 |
| York Bootham | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 8.03 | 13.81 | 0 |
| Southend-on-Sea | East of England | Urban Background | 28 | 0 | 28 | 7.74 | 11.76 | 0 |
| Leamington Spa | West Midlands | Urban Background | 30 | 0 | 30 | 7.70 | 12.01 | 0 |
| Leamington Spa Rugby Road | West Midlands | Urban Traffic | 30 | 0 | 30 | 7.69 | 12.63 | 0 |
| Oxford St Ebbes | South East | Urban Background | 30 | 0 | 30 | 7.59 | 14.20 | 0 |
| Barnsley Gawber | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 7.48 | 12.18 | 0 |
| Northampton Spring Park | East Midlands | Urban Background | 28 | 0 | 28 | 7.46 | 12.11 | 0 |
| Coventry Allesley | West Midlands | Urban Background | 25 | 0 | 25 | 7.37 | 12.63 | 0 |
| Sunderland Silksworth | North East | Urban Background | 18 | 0 | 18 | 7.34 | 10.35 | 0 |
| Walsall Woodlands | West Midlands | Urban Background | 28 | 0 | 28 | 7.28 | 11.71 | 0 |
| Reading New Town | South East | Urban Background | 30 | 0 | 30 | 7.06 | 10.96 | 0 |
| Telford Hollinswood | West Midlands | Urban Background | 28 | 0 | 28 | 6.93 | 10.52 | 0 |
| Norwich Lakenfields | East of England | Urban Background | 30 | 0 | 30 | 6.85 | 11.70 | 0 |
| Brighton Preston Park | South East | Urban Background | 28 | 0 | 28 | 6.61 | 10.88 | 0 |
| Stockton-on-Tees Eaglescliffe | North East | Urban Traffic | 28 | 0 | 28 | 6.49 | 11.97 | 0 |
| Immingham Woodlands Avenue | Yorkshire and the Humber | Urban Background | 30 | 0 | 30 | 6.35 | 9.33 | 0 |
| Wirral Tranmere | North West | Urban Background | 30 | 0 | 30 | 6.10 | 10.03 | 0 |
| Crewe Coppenhall | North West | Urban Background | 27 | 0 | 27 | 6.09 | 10.00 | 0 |
| Hartlepool St Abbs Walk | North East | Urban Background | 30 | 0 | 30 | 5.92 | 8.85 | 0 |
| Bournemouth | South West | Urban Background | 29 | 0 | 29 | 5.88 | 9.35 | 0 |
| Carlisle Morton A595 | North West | Urban Traffic | 30 | 0 | 30 | 5.61 | 8.84 | 0 |
| Chesterfield Loundsley Green | East Midlands | Urban Background | 30 | 0 | 30 | 4.95 | 7.69 | 0 |
| Blackpool Marton | North West | Urban Background | 30 | 0 | 30 | 4.72 | 8.47 | 0 |
| Swindon Walcot | South West | Urban Background | 30 | 0 | 30 | 4.65 | 8.31 | 0 |
| Honiton | South West | Urban Background | 30 | 0 | 30 | 4.46 | 6.90 | 0 |
| Eastbourne | South East | Urban Background | 25 | 0 | 25 | 4.05 | 8.27 | 0 |
| Leominster | West Midlands | Suburban Background | 30 | 0 | 30 | 3.88 | 7.16 | 0 |
WHO 2021 24-hour AQG of 25 µg/m³ is contextual, not a UK legal threshold.
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