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Measured pollution levels across Wales

View 24 Hour Maximums


Site 8 Hour mean Ozone
µg/m³
Hourly mean Nitrogen
Dioxide
µg/m³
Max 15 min mean Sulphur
Dioxide
µg/m³
24 Hour mean PM2.5
Particles
µg/m³
24 Hour mean PM10
Particles
µg/m³
Updated
Aston Hill  67 (3 Low) 2 (1 Low) n/m n/m n/m 11/12/2017 24:00
Anglesey Felin Cafnan  n/m n/m n/m 3 (1 Low) 5 (1 Low) 11/12/2017 24:00
Anglesey Llynfaes  n/m n/m n/m 2 (1 Low) 4 (1 Low) 11/12/2017 24:00
Anglesey Brynteg  n/m n/m n/m 2 (1 Low) 4 (1 Low) 11/12/2017 24:00
Caerphilly Islwyn Road Wattsville  n/m 52 (1 Low) n/m n/m n/m 11/12/2017 21:00
Caerphilly White Street  n/m 53 (1 Low) n/m n/m 9 (1 Low) 11/12/2017 23:00
Caerphilly Blackwood High Street  n/m 42 (1 Low) n/m n/m 10 (1 Low) 11/12/2017 23:00
Hafod-yr-ynys Roadside  n/m 49 (1 Low) n/m n/m n/m 11/12/2017 24:00
Nantgarw Road  n/m 94 (2 Low) n/m n/m n/m 11/12/2017 21:00
Caerphilly Fochriw  n/m n/m n/m 3 (1 Low) 7 (1 Low) 11/12/2017 24:00
Cardiff Centre  10 (1 Low) 47 (1 Low) 2 (1 Low) 6 (1 Low) 12 (1 Low) 11/12/2017 24:00
Chepstow A48  n/m 21 (1 Low) n/m 5 (1 Low) 11 (1 Low) 11/12/2017 24:00
Cwmbran  34 (2 Low) 43 (1 Low) n/m n/m 11 (1 Low) 11/12/2017 24:00
V Glamorgan Windsor Road Penarth  - - n/m n/m - 11/12/2017 24:00
Marchlyn Mawr  - - n/m n/m n/m 11/12/2017 24:00
Newport St Julians Comp School  n/m - n/m - - 11/12/2017 24:00
Newport M4 Junction 25  14 (1 Low) 92 (2 Low) n/m n/m n/m 11/12/2017 23:00
Cimla Road / Victoria Gardens  n/m 21 (1 Low) n/m n/m n/m 11/12/2017 07:00
Narberth  49 (2 Low) 2 (1 Low) 14 (1 Low) n/m 5 (1 Low) 11/12/2017 24:00
Port Talbot Theodore Road  n/m n/m n/m n/m 4 (1 Low) 11/12/2017 23:00
Port Talbot Prince Street 2  n/m n/m n/m 1 (1 Low) 2 (1 Low) 11/12/2017 24:00
Port Talbot Margam  - 21 (1 Low) 1 (1 Low) 5 (1 Low) 7 (1 Low) 11/12/2017 24:00
Port Talbot Dyffryn School  n/m n/m n/m n/m - 11/12/2017 24:00
Port Talbot Docks  n/m n/m n/m n/m 6 (1 Low) 11/12/2017 23:00
Port Talbot Talbot Road  n/m n/m n/m n/m 11 (1 Low) 11/12/2017 23:00
Port Talbot Twll-yn-y-Wal Park  n/m n/m n/m n/m 11 (1 Low) 11/12/2017 23:00
Port Talbot Little Warren  n/m n/m n/m n/m 7 (1 Low) 11/12/2017 23:00
Rhondda-Cynon-Taf Broadway  n/m 61 (1 Low) n/m n/m n/m 11/12/2017 20:00
Rhondda Pontypridd Gelliwastad Rd  n/m 8 (1 Low) n/m n/m n/m 11/12/2017 07:00
Rhondda Glyncoch Garth Avenue  n/m n/m n/m n/m 3 (1 Low) 11/12/2017 23:00
Rhondda Mountain Ash  n/m 94 (2 Low) n/m n/m n/m 11/12/2017 21:00
Swansea Station Court High Street  n/m 76 (2 Low) n/m n/m n/m 11/12/2017 23:00
Swansea Roadside  n/m 54 (1 Low) n/m 11 (1 Low) 13 (1 Low) 11/12/2017 24:00
Swansea Morriston Roadside  44 (2 Low) 39 (1 Low) n/m - n/m 11/12/2017 24:00
Swansea Hafod DOAS  22 (1 Low) 75 (2 Low) n/m n/m n/m 11/12/2017 24:00
Swansea St Thomas DOAS  34 (2 Low) 69 (2 Low) - n/m n/m 11/12/2017 24:00
Swansea Cwm Level Park  9 (1 Low) 50 (1 Low) n/m n/m n/m 11/12/2017 23:00
Twynyrodyn  n/m n/m n/m - - 11/12/2017 24:00
Wrexham  n/m 40 (1 Low) 1 (1 Low) n/m n/m 11/12/2017 24:00

Key

Air pollution is measured on a scale of 1 - 10 Index Points which are grouped into the following bands:
» Find out more about the air quality index.

Index 1 2 3 4 5 6 7 8 9 10
Band Low Moderate High Very high