Current Levels

Current measured levels are shown in the table below - showing concentrations and, where applicable, the corresponding index and bands.

Site 8 Hour mean
Ozone
µgm-3
Hourly mean
Nitrogen dioxide
µgm-3
Max 15 min mean
Sulphur dioxide
µgm-3
Running 24 Hour mean
PM2.5
Particles
µgm-3
Running 24 Hour mean
PM10
Particles
µgm-3
Aston Expressway A494 Deeside
Updated: 03/07/2025 06:00
Not measured 6
Low (1)
Not measured Not measured Not measured
Aston Hill
Updated: 03/07/2025 06:00
67
Low (3)
2
Low (1)
Not measured Not measured Not measured
Caerphilly Islwyn Road Wattsville
Updated: 02/07/2025 20:00
Not measured No data Not measured Not measured Not measured
Caerphilly White Street
Updated: 03/07/2025 05:00
Not measured 12
Low (1)
Not measured Not measured 9
Low (1)
Cardiff Castle Street
Updated: 03/07/2025 06:00
Not measured 14
Low (1)
Not measured 3
Low (1)
12
Low (1)
Cardiff Centre
Updated: 03/07/2025 06:00
34
Low (2)
10
Low (1)
1
Low (1)
5
Low (1)
11
Low (1)
Cardiff Newport Road
Updated: 03/07/2025 06:00
Not measured 20
Low (1)
Not measured Not measured 11
Low (1)
Chepstow A48
Updated: 03/07/2025 06:00
Not measured 17
Low (1)
Not measured 4
Low (1)
8
Low (1)
Cimla Road / Victoria Gardens
Updated: 28/06/2024 09:00
Not measured No data Not measured Not measured Not measured
Cwmbran Crownbridge
Updated: 03/07/2025 06:00
40
Low (2)
14
Low (1)
Not measured Not measured 10
Low (1)
Hafod-yr-ynys Hill Roadside
Updated: 03/07/2025 01:00
Not measured No data Not measured Not measured Not measured
Marchlyn Mawr
Updated: 03/07/2025 06:00
55
Low (2)
1
Low (1)
Not measured Not measured Not measured
Nantgarw Road
Updated: 03/07/2025 05:00
Not measured 10
Low (1)
Not measured Not measured Not measured
Narberth
Updated: 03/07/2025 06:00
38
Low (2)
2
Low (1)
1
Low (1)
3
Low (1)
7
Low (1)
Newport M4 Junction 25
Updated: 03/07/2025 06:00
21
Low (1)
No data Not measured Not measured Not measured
Newport M4 Junction 25 West
Updated: 03/07/2025 06:00
Not measured 27
Low (1)
Not measured Not measured Not measured
Newport St Julians Comp School
Updated: 03/07/2025 06:00
Not measured 15
Low (1)
Not measured 2
Low (1)
6
Low (1)
Port Talbot Dyffryn School
Updated: 03/07/2025 06:00
Not measured Not measured Not measured 5
Low (1)
8
Low (1)
Port Talbot Little Warren
Updated: 03/07/2025 06:00
Not measured Not measured Not measured 5
Low (1)
9
Low (1)
Port Talbot M4 Junction 41
Updated: 03/07/2025 06:00
Not measured 23
Low (1)
Not measured Not measured Not measured
Port Talbot Margam
Updated: 03/07/2025 06:00
33
Low (1)
7
Low (1)
1
Low (1)
4
Low (1)
12
Low (1)
Port Talbot Prince Street 2
Updated: 03/07/2025 06:00
Not measured Not measured Not measured 4
Low (1)
9
Low (1)
Rhondda Glyncoch Garth Avenue
Updated: 03/07/2025 06:00
Not measured Not measured Not measured 6
Low (1)
9
Low (1)
Rhondda Mountain Ash
Updated: 01/07/2025 18:00
Not measured No data Not measured Not measured Not measured
Rhondda Pontypridd Gelliwastad Rd
Updated: 02/07/2025 14:00
Not measured 15
Low (1)
Not measured Not measured Not measured
Rhondda-Cynon-Taf Broadway
Updated: 01/07/2025 19:00
Not measured No data Not measured Not measured Not measured
Rhondda-Cynon-Taf Pontypridd A470
Updated: 03/07/2025 06:00
Not measured 14
Low (1)
Not measured Not measured Not measured
Swansea Cwm Level Park
Updated: 24/01/2025 13:00
No data No data Not measured Not measured Not measured
Swansea Hafod DOAS
Updated: 25/01/2025 18:00
No data No data Not measured Not measured Not measured
Swansea Morfa Road NOX
Updated: 23/01/2025 20:00
Not measured No data Not measured Not measured Not measured
Swansea Morriston Roadside
Updated: 14/11/2024 15:00
No data No data Not measured No data Not measured
Swansea Port Tennant Roadside
Updated: 31/01/2025 12:00
Not measured No data Not measured No data Not measured
Swansea Roadside
Updated: 03/07/2025 06:00
Not measured 11
Low (1)
Not measured 5
Low (1)
11
Low (1)
Swansea St Thomas DOAS
Updated: 25/01/2025 18:00
No data No data No data Not measured Not measured
Swansea Station Court High Street
Updated: 31/01/2025 13:00
Not measured No data Not measured Not measured Not measured
Wrexham
Updated: 03/07/2025 06:00
Not measured 5
Low (1)
No data 2
Low (1)
8
Low (1)
Wrexham A483
Updated: 08/05/2025 21:00
Not measured No data Not measured Not measured Not measured
Wrexham Chirk
Updated: 05/06/2025 12:00
Not measured No data Not measured 3
Low (1)
27
Low (2)
Wrexham Chirk Community Hospital
Updated: 05/06/2025 11:00
Not measured No data Not measured No data No data