Latest measured levels based on data provided by the Environment Agency

Here you can view the detailed data behind the latest measurement summary displayed on UK-AIR, and also a summary of information that has been displayed over the previous 24 hours. The detailed data tabulated below are from monitoring sites within the AURN. Graphs of hourly monitoring data are also available to view as weekly time series. You can also subscribe to this information as an email alert.

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Pollutant levels recorded for the hour up to midnight Thu 18th Sep 2025

Central Scotland

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Auchencorth Moss Timeseries Graph	54 (2 Low)	n/m	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Bush Estate Timeseries Graph	56 (2 Low)	1 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Dumbarton Roadside Timeseries Graph	n/m	10 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Edinburgh Nicolson Street Timeseries Graph	n/m	20 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Edinburgh St Leonards Timeseries Graph	39 (2 Low)	16 (1 Low)	n/a	5 (1 Low)	11 (1 Low) ^*2	18/09/2025 24:00:
Glasgow Great Western Road Timeseries Graph	n/m	24 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Glasgow High Street Timeseries Graph	n/m	30 (1 Low)	n/m	6 (1 Low)	14 (1 Low) ^*2	18/09/2025 24:00:
Glasgow Kerbside Timeseries Graph	n/m	66 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Glasgow Townhead Timeseries Graph	49 (2 Low)	21 (1 Low)	n/m	6 (1 Low)	13 (1 Low) ^*2	18/09/2025 24:00:
Grangemouth Timeseries Graph	n/m	21 (1 Low)	2 (1 Low)	6 (1 Low)	14 (1 Low) ^*1	18/09/2025 24:00:
Grangemouth Moray Timeseries Graph	n/m	10 (1 Low)	n/m	n/m	n/m	18/09/2025 23:00:00
Greenock A8 Roadside Timeseries Graph	n/m	13 (1 Low)	n/m	6 (1 Low)	11 (1 Low) ^*2	18/09/2025 24:00:

East Midlands

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Chesterfield Loundsley Green Timeseries Graph	42 (2 Low)	7 (1 Low)	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Chesterfield Roadside Timeseries Graph	n/m	n/a	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Derby St Alkmund's Way Timeseries Graph	n/m	13 (1 Low)	n/m	2 (1 Low)	n/m	18/09/2025 24:00:
Derby Stockbrook Park Timeseries Graph	32 (1 Low)	n/m	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Ladybower Timeseries Graph	51 (2 Low)	1 (1 Low)	1 (1 Low)	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Leicester A594 Roadside Timeseries Graph	n/m	8 (1 Low)	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Leicester University Timeseries Graph	36 (2 Low)	13 (1 Low)	n/m	1 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:
Lincoln Canwick Road Timeseries Graph	n/m	4 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Loughborough Thorpe Acre Timeseries Graph	n/m	n/m	n/m	1 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Mansfield Ladybrook Timeseries Graph	n/m	n/m	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Northampton Spring Park Timeseries Graph	42 (2 Low)	4 (1 Low)	n/m	6 (1 Low)	n/m	18/09/2025 24:00:
Nottingham Bilborough Timeseries Graph	n/m	n/m	n/m	1 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Nottingham Kenmore Gardens Timeseries Graph	37 (2 Low)	8 (1 Low)	0 (1 Low)	2 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Nottingham Western Boulevard Timeseries Graph	n/m	n/a	n/m	2 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Tallington Timeseries Graph	43 (2 Low)	n/m	n/m	1 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:
Toft Newton Timeseries Graph	38 (2 Low)	4 (1 Low)	n/m	1 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:

Eastern

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Borehamwood Meadow Park Timeseries Graph	n/m	25 (1 Low)	n/m	3 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Cambridge Roadside Timeseries Graph	n/m	9 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Luton A505 Roadside Timeseries Graph	n/m	11 (1 Low)	n/m	2 (1 Low)	n/m	18/09/2025 24:00:
Norwich Lakenfields Timeseries Graph	36 (2 Low)	7 (1 Low)	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Peterborough Garton End Timeseries Graph	n/m	n/m	n/m	1 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:
Sibton Timeseries Graph	34 (2 Low)	n/m	n/m	4 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
Southend Shoeburyness Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Southend-on-Sea Timeseries Graph	39 (2 Low)	3 (1 Low)	n/m	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
St Osyth Timeseries Graph	42 (2 Low)	6 (1 Low)	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Stanford-le-Hope Roadside Timeseries Graph	n/m	5 (1 Low)	n/m	4 (1 Low)	6 (1 Low) ^*1	18/09/2025 24:00:
Thurrock Timeseries Graph	47 (2 Low)	8 (1 Low)	1 (1 Low)	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Weybourne Timeseries Graph	40 (2 Low)	n/m	n/m	1 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:
Wicken Fen Timeseries Graph	34 (2 Low)	3 (1 Low)	n/a	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:

Greater London

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Camden Kerbside Timeseries Graph	n/m	14 (1 Low)	n/m	7 (1 Low)	12 (1 Low) ^*1	18/09/2025 24:00:
Ealing Horn Lane Timeseries Graph	n/m	n/m	n/m	n/m	18 (2 Low) ^*1	18/09/2025 24:00:
Haringey Roadside Timeseries Graph	n/m	20 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
London Bexley Timeseries Graph	n/m	8 (1 Low)	n/m	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
London Bloomsbury Timeseries Graph	38 (2 Low)	11 (1 Low)	1 (1 Low)	4 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
London Haringey Priory Park South Timeseries Graph	38 (2 Low)	4 (1 Low)	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
London Harlington Timeseries Graph	29 (1 Low)	35 (1 Low)	n/m	n/a	n/a	18/09/2025 22:00:00
London Hillingdon Timeseries Graph	23 (1 Low)	24 (1 Low)	n/m	3 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
London Honor Oak Park Timeseries Graph	49 (2 Low)	n/m	n/m	4 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
London Marylebone Road Timeseries Graph	22 (1 Low)	22 (1 Low)	1 (1 Low)	2 (1 Low)	15 (1 Low) ^*1	18/09/2025 24:00:
London N. Kensington Timeseries Graph	43 (2 Low)	6 (1 Low)	n/a	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
London Norbury Manor School Timeseries Graph	n/m	n/m	n/m	4 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
London Teddington Bushy Park Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
London Westminster Timeseries Graph	31 (1 Low)	7 (1 Low)	n/m	n/a	n/m	18/09/2025 24:00:
Southwark A2 Old Kent Road Timeseries Graph	n/m	12 (1 Low)	n/m	n/m	8 (1 Low) ^*1	18/09/2025 24:00:

Highland

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Fort William Timeseries Graph	40 (2 Low)	5 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Inverness Timeseries Graph	n/m	2 (1 Low)	n/m	2 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Lerwick Timeseries Graph	67 (3 Low)	n/m	n/m	n/m	n/m	18/09/2025 24:00:
Strathvaich Timeseries Graph	62 (2 Low)	n/m	n/m	n/m	n/m	18/09/2025 24:00:

North East

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Hartlepool St Abbs Walk Timeseries Graph	41 (2 Low)	6 (1 Low)	n/m	5 (1 Low)	9 (1 Low) ^*2	18/09/2025 24:00:
Kielder Water Timeseries Graph	46 (2 Low)	n/m	n/m	5 (1 Low)	10 (1 Low) ^*2	18/09/2025 24:00:
Middlesbrough Timeseries Graph	n/a	n/a	n/a	n/a	n/a	18/09/2025 14:00:00
Newcastle Centre Timeseries Graph	41 (2 Low)	9 (1 Low)	n/m	6 (1 Low)	15 (1 Low) ^*1	18/09/2025 24:00:
Newcastle Cradlewell Roadside Timeseries Graph	n/m	10 (1 Low)	n/m	5 (1 Low)	10 (1 Low) ^*2	18/09/2025 24:00:
Stockton-on-Tees A1305 Roadside Timeseries Graph	n/m	6 (1 Low)	n/m	3 (1 Low)	n/m	18/09/2025 24:00:
Stockton-on-Tees Eaglescliffe Timeseries Graph	n/m	4 (1 Low)	n/m	5 (1 Low)	10 (1 Low) ^*1	18/09/2025 24:00:
Sunderland Silksworth Timeseries Graph	46 (2 Low)	2 (1 Low)	n/m	5 (1 Low)	9 (1 Low) ^*2	18/09/2025 24:00:
Sunderland Wessington Way Timeseries Graph	n/m	2 (1 Low)	n/m	5 (1 Low)	n/m	18/09/2025 24:00:

North East Scotland

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Aberdeen Erroll Park Timeseries Graph	54 (2 Low)	10 (1 Low)	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Aberdeen Wellington Road Timeseries Graph	n/m	9 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Dundee Mains Loan Timeseries Graph	n/m	8 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Perth Glasgow Road Timeseries Graph	n/m	10 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:

North Wales

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Aston Hill Timeseries Graph	47 (2 Low)	2 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Wrexham Timeseries Graph	n/m	2 (1 Low)	1 (1 Low)	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:

North West & Merseyside

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Birkenhead Borough Road Timeseries Graph	n/m	2 (1 Low)	n/m	4 (1 Low)	n/m	18/09/2025 24:00:
Blackburn Accrington Road Timeseries Graph	n/m	12 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Blackburn Audley Park Timeseries Graph	36 (2 Low)	n/m	n/m	4 (1 Low)	8 (1 Low) ^*2	18/09/2025 24:00:
Blackpool Marton Timeseries Graph	42 (2 Low)	2 (1 Low)	n/m	6 (1 Low)	15 (1 Low) ^*2	18/09/2025 24:00:
Blackpool Whitegate Drive Timeseries Graph	n/m	n/m	n/m	7 (1 Low)	n/m	18/09/2025 24:00:
Bury Whitefield Roadside Timeseries Graph	n/m	5 (1 Low)	n/m	n/m	12 (1 Low) ^*1	18/09/2025 24:00:
Carlisle Morton A595 Timeseries Graph	n/m	3 (1 Low)	n/m	6 (1 Low)	16 (1 Low) ^*1	18/09/2025 24:00:
Crewe Coppenhall Timeseries Graph	43 (2 Low)	2 (1 Low)	n/m	2 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Glazebury Timeseries Graph	43 (2 Low)	2 (1 Low)	n/m	4 (1 Low)	10 (1 Low) ^*2	18/09/2025 24:00:
Liverpool Speke Timeseries Graph	45 (2 Low)	3 (1 Low)	1 (1 Low)	6 (1 Low)	10 (1 Low) ^*1	18/09/2025 24:00:
Liverpool Thirlmere Park Timeseries Graph	37 (2 Low)	n/m	n/m	4 (1 Low)	8 (1 Low) ^*2	18/09/2025 24:00:
Manchester Piccadilly Timeseries Graph	32 (1 Low)	14 (1 Low)	1 (1 Low)	5 (1 Low)	8 (1 Low) ^*2	18/09/2025 24:00:
Manchester Sharston Timeseries Graph	35 (2 Low)	4 (1 Low)	n/m	2 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
Middlewich St Michael's Way Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	n/m	18/09/2025 24:00:
Preston Timeseries Graph	39 (2 Low)	4 (1 Low)	n/m	4 (1 Low)	9 (1 Low) ^*2	18/09/2025 24:00:
Salford Eccles Timeseries Graph	47 (2 Low)	5 (1 Low)	n/m	4 (1 Low)	10 (1 Low) ^*2	18/09/2025 24:00:
Shaw Crompton Way Timeseries Graph	n/m	7 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
St Helens Linkway Timeseries Graph	n/m	33 (1 Low)	n/m	n/m	9 (1 Low) ^*1	18/09/2025 24:00:
Tameside A635 Manchester Road Timeseries Graph	n/m	n/m	n/m	5 (1 Low)	n/m	18/09/2025 24:00:
Warrington Timeseries Graph	n/m	10 (1 Low)	n/m	2 (1 Low)	9 (1 Low) ^*1	18/09/2025 24:00:
Widnes Milton Road Timeseries Graph	n/m	15 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Wigan Centre Timeseries Graph	37 (2 Low)	8 (1 Low)	n/m	5 (1 Low)	10 (1 Low) ^*2	18/09/2025 24:00:
Wirral Tranmere Timeseries Graph	44 (2 Low)	1 (1 Low)	n/m	3 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:

Northern Ireland

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Armagh Roadside Timeseries Graph	n/m	7 (1 Low)	n/m	n/m	19 (2 Low) ^*1	18/09/2025 24:00:
Ballymena Antrim Road Timeseries Graph	n/m	3 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Ballymena Ballykeel Timeseries Graph	n/m	2 (1 Low)	2 (1 Low)	n/m	n/m	18/09/2025 24:00:
Belfast Centre Timeseries Graph	29 (1 Low)	6 (1 Low)	1 (1 Low)	7 (1 Low)	15 (1 Low) ^*2	18/09/2025 24:00:
Belfast Stockman's Lane Timeseries Graph	n/m	8 (1 Low)	n/m	n/m	21 (2 Low) ^*1	18/09/2025 24:00:
Derry Rosemount Timeseries Graph	38 (2 Low)	2 (1 Low)	1 (1 Low)	3 (1 Low)	12 (1 Low) ^*1	18/09/2025 24:00:
Lough Navar Timeseries Graph	42 (2 Low)	n/m	n/m	4 (1 Low)	9 (1 Low) ^*2	18/09/2025 24:00:

Scottish Borders

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Dumfries Timeseries Graph	n/m	3 (1 Low)	n/m	n/m	n/m	18/09/2025 23:00:00
Eskdalemuir Timeseries Graph	48 (2 Low)	1 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Peebles Timeseries Graph	58 (2 Low)	1 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:

South East

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Brighton Preston Park Timeseries Graph	41 (2 Low)	12 (1 Low)	n/m	5 (1 Low)	9 (1 Low) ^*2	18/09/2025 24:00:
Chatham Roadside Timeseries Graph	n/m	8 (1 Low)	n/m	n/a	n/a	18/09/2025 24:00:
Chilbolton Observatory Timeseries Graph	51 (2 Low)	4 (1 Low)	1 (1 Low)	3 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Eastbourne Timeseries Graph	46 (2 Low)	24 (1 Low)	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Farnborough Cherrywood Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Horley Timeseries Graph	n/m	15 (1 Low)	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Lullington Heath Timeseries Graph	46 (2 Low)	27 (1 Low)	1 (1 Low)	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Maidstone Upper Stone Street Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Milton Keynes Civic Centre Timeseries Graph	43 (2 Low)	n/m	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Oxford Centre Roadside Timeseries Graph	n/m	n/a	n/m	n/m	n/m	20/08/2025 09:00:00
Oxford St Ebbes Timeseries Graph	38 (2 Low)	7 (1 Low)	n/m	2 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Portsmouth Timeseries Graph	37 (2 Low)	11 (1 Low)	n/m	4 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
Portsmouth Anglesea Road Timeseries Graph	n/m	22 (1 Low)	n/m	4 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
Reading London Road Timeseries Graph	n/m	11 (1 Low)	n/m	n/m	9 (1 Low) ^*1	18/09/2025 24:00:
Reading New Town Timeseries Graph	35 (2 Low)	9 (1 Low)	n/m	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Reading Rose Kiln Lane Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	n/m	18/09/2025 24:00:
Rochester Stoke Timeseries Graph	44 (2 Low)	6 (1 Low)	1 (1 Low)	3 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Slough Windmill Bath Road Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Southampton A33 Timeseries Graph	n/m	17 (1 Low)	n/m	4 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
Southampton Centre Timeseries Graph	36 (2 Low)	20 (1 Low)	1 (1 Low)	4 (1 Low)	8 (1 Low) ^*2	18/09/2025 24:00:
Storrington Roadside Timeseries Graph	n/m	9 (1 Low)	n/m	4 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
Worthing A27 Roadside Timeseries Graph	n/m	22 (1 Low)	n/m	7 (1 Low)	n/m	18/09/2025 24:00:
Worthing East Ten Acres Timeseries Graph	n/m	n/m	n/m	6 (1 Low)	11 (1 Low) ^*2	18/09/2025 24:00:

South Wales

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Cardiff Centre Timeseries Graph	39 (2 Low)	11 (1 Low)	0 (1 Low)	5 (1 Low)	7 (1 Low) ^*1	18/09/2025 24:00:
Cardiff Newport Road Timeseries Graph	n/m	6 (1 Low)	n/m	n/m	8 (1 Low) ^*1	18/09/2025 24:00:
Chepstow A48 Timeseries Graph	n/m	n/a	n/m	2 (1 Low)	5 (1 Low) ^*1	18/09/2025 24:00:
Cwmbran Crownbridge Timeseries Graph	43 (2 Low)	5 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Hafod-yr-ynys Hill Roadside Timeseries Graph	n/m	6 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Narberth Timeseries Graph	n/a	n/a	n/a	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 23:00:00
Newport Timeseries Graph	n/m	5 (1 Low)	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Port Talbot Margam Timeseries Graph	34 (2 Low)	11 (1 Low)	1 (1 Low)	3 (1 Low)	14 (1 Low) ^*3	18/09/2025 24:00:
Swansea Roadside Timeseries Graph	n/m	6 (1 Low)	n/m	5 (1 Low)	8 (1 Low) ^*1	18/09/2025 24:00:

South West

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Barnstaple A39 Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Bath A4 Roadside Timeseries Graph	n/m	6 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Bournemouth Timeseries Graph	48 (2 Low)	6 (1 Low)	n/m	5 (1 Low)	n/m	18/09/2025 24:00:
Bristol St Paul's Timeseries Graph	n/a	7 (1 Low)	n/m	2 (1 Low)	7 (1 Low) ^*1	18/09/2025 24:00:
Bristol Temple Way Timeseries Graph	n/m	12 (1 Low)	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Charlton Mackrell Timeseries Graph	45 (2 Low)	3 (1 Low)	n/m	4 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
Cheltenham A40 Gloucester Road Timeseries Graph	n/m	n/m	n/m	1 (1 Low)	n/m	18/09/2025 24:00:
Christchurch Barrack Road Timeseries Graph	n/m	5 (1 Low)	n/m	6 (1 Low)	n/m	18/09/2025 24:00:
Exeter Roadside Timeseries Graph	44 (2 Low)	7 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Gloucester Tredworth Timeseries Graph	n/m	n/m	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Honiton Timeseries Graph	47 (2 Low)	2 (1 Low)	n/m	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
London Farringdon Street Timeseries Graph	n/m	23 (1 Low)	n/m	5 (1 Low)	n/m	18/09/2025 24:00:
Plymouth Centre Timeseries Graph	46 (2 Low)	4 (1 Low)	n/m	7 (1 Low)	13 (1 Low) ^*2	18/09/2025 24:00:
Plymouth Tavistock Road Timeseries Graph	n/m	7 (1 Low)	n/m	n/m	n/m	18/09/2025 23:00:00
Saltash Callington Road Timeseries Graph	n/m	n/m	n/m	2 (1 Low)	13 (1 Low) ^*1	18/09/2025 24:00:
Swindon Walcot Timeseries Graph	45 (2 Low)	n/a	n/m	3 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Yarner Wood Timeseries Graph	49 (2 Low)	2 (1 Low)	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:

West Ireland

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Mace Head Timeseries Graph	70 (3 Low)	n/m	n/m	n/m	n/m	18/09/2025 24:00:

West Midlands

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Birmingham A4540 Roadside Timeseries Graph	26 (1 Low)	18 (1 Low)	n/m	2 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Birmingham Hall Green Timeseries Graph	54 (2 Low)	7 (1 Low)	n/m	1 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Birmingham Ladywood Timeseries Graph	37 (2 Low)	7 (1 Low)	1 (1 Low)	n/a	n/a	18/09/2025 24:00:
Birmingham University Timeseries Graph	n/m	n/m	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Burton-on-Trent Horninglow Timeseries Graph	42 (2 Low)	9 (1 Low)	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Cannock A5190 Roadside Timeseries Graph	n/m	5 (1 Low)	n/m	1 (1 Low)	n/m	18/09/2025 24:00:
Coventry Allesley Timeseries Graph	40 (2 Low)	5 (1 Low)	n/m	1 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Coventry Binley Road Timeseries Graph	n/m	4 (1 Low)	n/m	2 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:
Leamington Spa Timeseries Graph	46 (2 Low)	6 (1 Low)	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Leamington Spa Rugby Road Timeseries Graph	n/m	4 (1 Low)	n/m	1 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:
Leominster Timeseries Graph	39 (2 Low)	4 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Oldbury Birmingham Road Timeseries Graph	n/m	10 (1 Low)	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Shrewsbury Underdale Timeseries Graph	n/m	n/m	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:
Stoke-on-Trent A50 Roadside Timeseries Graph	n/m	9 (1 Low)	n/m	2 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Stoke-on-Trent Centre Timeseries Graph	37 (2 Low)	0 (1 Low)	n/m	n/a	n/a	18/09/2025 24:00:
Telford Hollinswood Timeseries Graph	49 (2 Low)	2 (1 Low)	n/m	1 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:
Walsall Woodlands Timeseries Graph	44 (2 Low)	6 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
West Bromwich Kenrick Park Timeseries Graph	33 (1 Low)	7 (1 Low)	n/m	n/m	n/m	18/09/2025 24:00:
Worcester Tolladine Timeseries Graph	n/m	n/m	n/m	2 (1 Low)	4 (1 Low) ^*2	18/09/2025 24:00:

Yorkshire & Humberside

Latest measured levels based on data provided by the Environment Agency
Monitoring site	Running 8 Hour mean Ozone (µgm^-3)	Hourly mean Nitrogen dioxide (µgm^-3)	Max 15 min mean Sulphur dioxide (µgm^-3)	Running 24 Hour mean PM_2.5 Particles (µgm^-3)	Running 24 Hour mean PM₁₀ Particles (µgm^-3)	Last updated
Barnsley Gawber Timeseries Graph	47 (2 Low)	2 (1 Low)	1 (1 Low)	2 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Bradford Mayo Avenue Timeseries Graph	n/m	8 (1 Low)	n/m	n/m	n/m	18/09/2025 23:00:00
Bradford Shipley Airedale Road Timeseries Graph	n/m	n/m	n/m	4 (1 Low)	9 (1 Low) ^*2	18/09/2025 24:00:
Dewsbury Ashworth Grange Timeseries Graph	56 (2 Low)	1 (1 Low)	n/m	3 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Doncaster A630 Cleveland Street Timeseries Graph	n/m	9 (1 Low)	n/m	2 (1 Low)	n/m	18/09/2025 24:00:
Harrogate Woodlands Timeseries Graph	n/m	n/m	n/m	4 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
High Muffles Timeseries Graph	n/a	n/a	n/m	n/a	n/a	18/09/2025 16:00:00
Hull Freetown Timeseries Graph	31 (1 Low)	13 (1 Low)	1 (1 Low)	3 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
Hull Holderness Road Timeseries Graph	n/m	21 (1 Low)	n/m	3 (1 Low)	9 (1 Low) ^*2	18/09/2025 24:00:
Immingham Woodlands Avenue Timeseries Graph	43 (2 Low)	3 (1 Low)	n/m	1 (1 Low)	3 (1 Low) ^*2	18/09/2025 24:00:
Leeds Centre Timeseries Graph	35 (2 Low)	6 (1 Low)	1 (1 Low)	4 (1 Low)	8 (1 Low) ^*2	18/09/2025 24:00:
Leeds Headingley Kerbside Timeseries Graph	n/m	4 (1 Low)	n/m	6 (1 Low)	12 (1 Low) ^*1	18/09/2025 24:00:
Rotherham East Dene Timeseries Graph	n/m	n/m	n/m	2 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Scunthorpe Town Timeseries Graph	n/m	7 (1 Low)	2 (1 Low)	n/a	n/a	18/09/2025 24:00:
Sheffield Barnsley Road Timeseries Graph	n/m	7 (1 Low)	n/m	5 (1 Low)	n/m	18/09/2025 24:00:
Sheffield Devonshire Green Timeseries Graph	39 (2 Low)	4 (1 Low)	n/m	2 (1 Low)	5 (1 Low) ^*2	18/09/2025 24:00:
Sheffield Tinsley Timeseries Graph	30 (1 Low)	5 (1 Low)	n/m	2 (1 Low)	6 (1 Low) ^*2	18/09/2025 24:00:
Wakefield Alverthorpe Timeseries Graph	n/m	n/m	n/m	3 (1 Low)	7 (1 Low) ^*2	18/09/2025 24:00:
York Bootham Timeseries Graph	27 (1 Low)	9 (1 Low)	n/m	4 (1 Low)	9 (1 Low) ^*1	18/09/2025 24:00:
York Fishergate Timeseries Graph	n/m	8 (1 Low)	n/m	5 (1 Low)	12 (1 Low) ^*1	18/09/2025 24:00:

Legend

n/m means that the pollutant is not measured at that site
n/a means that no data were recorded for the period
*1: measurements are PM₁₀ BAM 1020 heated
*2: measurements are PM₁₀ FIDAS
*3: measurements are PM₁₀ SEQ 47/50