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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  49 (2 Low) 1 (1 Low) n/m n/m n/m 20/08/2017 07:00
Anglesey Felin Cafnan  n/m n/m n/m - - 20/08/2017 07:00
Anglesey Llynfaes  n/m n/m n/m 7 (1 Low) 12 (1 Low) 20/08/2017 05:00
Anglesey Brynteg  n/m n/m n/m 7 (1 Low) 13 (1 Low) 20/08/2017 05:00
Caerphilly Islwyn Road Wattsville  n/m 7 (1 Low) n/m n/m n/m 20/08/2017 05:00
Caerphilly White Street  n/m 15 (1 Low) n/m n/m 16 (1 Low) 20/08/2017 07:00
Caerphilly Blackwood High Street  n/m 5 (1 Low) n/m n/m 16 (1 Low) 20/08/2017 07:00
Hafod-yr-ynys Roadside  n/m 41 (1 Low) n/m n/m n/m 20/08/2017 07:00
Nantgarw Road  n/m 8 (1 Low) n/m n/m n/m 20/08/2017 04:00
Caerphilly Fochriw  n/m n/m n/m - - 20/08/2017 07:00
Cardiff Centre  25 (1 Low) 25 (1 Low) 15 (1 Low) 6 (1 Low) 17 (2 Low) 20/08/2017 07:00
Chepstow A48  n/m 20 (1 Low) n/m - 16 (1 Low) 20/08/2017 07:00
Cwmbran  22 (1 Low) 13 (1 Low) n/m n/m 16 (1 Low) 20/08/2017 07:00
V Glamorgan Windsor Road Penarth  20 (1 Low) 15 (1 Low) n/m n/m 14 (1 Low) 20/08/2017 06:00
Marchlyn Mawr  - - n/m n/m n/m 20/08/2017 07:00
Newport St Julians Comp School  n/m - n/m - - 20/08/2017 07:00
Newport M4 Junction 25  5 (1 Low) 59 (1 Low) n/m n/m n/m 20/08/2017 07:00
Cimla Road / Victoria Gardens  n/m 10 (1 Low) n/m n/m n/m 20/08/2017 06:00
Narberth  39 (2 Low) 2 (1 Low) 5 (1 Low) n/m 11 (1 Low) 20/08/2017 07:00
Port Talbot Theodore Road  n/m n/m n/m n/m 15 (1 Low) 20/08/2017 07:00
Port Talbot Prince Street 2  n/m n/m n/m 7 (1 Low) 39 (3 Low) 20/08/2017 06:00
Port Talbot Margam  20 (1 Low) 8 (1 Low) - 8 (1 Low) 21 (2 Low) 20/08/2017 07:00
Port Talbot Dyffryn School  n/m n/m n/m n/m - 20/08/2017 07:00
Port Talbot Docks  n/m n/m n/m n/m 19 (2 Low) 20/08/2017 07:00
Port Talbot Talbot Road  n/m n/m n/m n/m 13 (1 Low) 20/08/2017 07:00
Port Talbot Twll-yn-y-Wal Park  n/m n/m n/m n/m 25 (2 Low) 20/08/2017 07:00
Port Talbot Little Warren  n/m n/m n/m n/m 21 (2 Low) 20/08/2017 07:00
Rhondda-Cynon-Taf Broadway  n/m 13 (1 Low) n/m n/m n/m 20/08/2017 06:00
Rhondda Pontypridd Gelliwastad Rd  n/m 6 (1 Low) n/m n/m n/m 20/08/2017 06:00
Rhondda Glyncoch Garth Avenue  n/m n/m n/m n/m 16 (1 Low) 20/08/2017 07:00
Rhondda Mountain Ash  n/m 29 (1 Low) n/m n/m n/m 20/08/2017 07:00
Swansea Station Court High Street  n/m 34 (1 Low) n/m n/m n/m 20/08/2017 07:00
Swansea Roadside  n/m 26 (1 Low) n/m 9 (1 Low) 15 (1 Low) 20/08/2017 07:00
Swansea Morriston Roadside  - - n/m - n/m 20/08/2017 07:00
Swansea Hafod DOAS  53 (2 Low) 27 (1 Low) n/m n/m n/m 20/08/2017 07:00
Swansea St Thomas DOAS  65 (2 Low) 19 (1 Low) - n/m n/m 20/08/2017 07:00
Swansea Cwm Level Park  - 10 (1 Low) n/m n/m n/m 20/08/2017 07:00
Twynyrodyn  n/m n/m n/m - - 20/08/2017 07:00
Wrexham  n/m 4 (1 Low) 4 (1 Low) n/m n/m 20/08/2017 07:00

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