Current measured levels are shown in the table below - showing concentrations and, where applicable, the corresponding index and bands.
Current Levels
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: 05/02/2025 13:00 |
Not measured | 10 Low (1) |
Not measured | Not measured | Not measured |
Aston Hill Updated: 05/02/2025 13:00 |
68 Low (3) |
1 Low (1) |
Not measured | Not measured | Not measured |
Bridgend Park Street Updated: 05/02/2025 13:00 |
Not measured | 62 Low (1) |
Not measured | Not measured | 14 Low (1) |
Caerphilly Blackwood High Street Updated: 03/12/2024 08:00 |
Not measured | No data | Not measured | Not measured | No data |
Caerphilly Fochriw Updated: 06/01/2025 22:00 |
Not measured | Not measured | Not measured | No data | No data |
Caerphilly Islwyn Road Wattsville Updated: 05/02/2025 12:00 |
Not measured | 28 Low (1) |
Not measured | Not measured | Not measured |
Caerphilly White Street Updated: 05/02/2025 13:00 |
Not measured | 45 Low (1) |
Not measured | Not measured | 21 Low (2) |
Cardiff Castle Street Updated: 05/02/2025 13:00 |
Not measured | 58 Low (1) |
Not measured | 7 Low (1) |
19 Low (2) |
Cardiff Centre Updated: 05/02/2025 13:00 |
15 Low (1) |
38 Low (1) |
1 Low (1) |
8 Low (1) |
15 Low (1) |
Cardiff Newport Road Updated: 05/02/2025 13:00 |
Not measured | 44 Low (1) |
Not measured | Not measured | 18 Low (2) |
Chepstow A48 Updated: 05/02/2025 13:00 |
Not measured | 49 Low (1) |
Not measured | 8 Low (1) |
17 Low (2) |
Cimla Road / Victoria Gardens Updated: 28/06/2024 09:00 |
Not measured | No data | Not measured | Not measured | Not measured |
Cwmbran Crownbridge Updated: 05/02/2025 13:00 |
16 Low (1) |
37 Low (1) |
Not measured | Not measured | 19 Low (2) |
Hafod-yr-ynys Hill Roadside Updated: 03/02/2025 07:00 |
Not measured | No data | Not measured | Not measured | Not measured |
Marchlyn Mawr Updated: 05/02/2025 13:00 |
No data | 1 Low (1) |
Not measured | Not measured | Not measured |
Nantgarw Road Updated: 05/02/2025 05:00 |
Not measured | 9 Low (1) |
Not measured | Not measured | Not measured |
Narberth Updated: 05/02/2025 13:00 |
72 Low (3) |
5 Low (1) |
2 Low (1) |
7 Low (1) |
18 Low (2) |
Newport M4 Junction 25 Updated: 05/02/2025 14:00 |
7 Low (1) |
60 Low (1) |
Not measured | Not measured | Not measured |
Newport M4 Junction 25 West Updated: 05/02/2025 13:00 |
Not measured | 47 Low (1) |
Not measured | Not measured | Not measured |
Newport St Julians Comp School Updated: 05/02/2025 13:00 |
Not measured | 48 Low (1) |
Not measured | 8 Low (1) |
18 Low (2) |
Port Talbot Dyffryn School Updated: 05/02/2025 13:00 |
Not measured | Not measured | Not measured | 9 Low (1) |
23 Low (2) |
Port Talbot Little Warren Updated: 05/02/2025 13:00 |
Not measured | Not measured | Not measured | 8 Low (1) |
30 Low (2) |
Port Talbot M4 Junction 41 Updated: 05/02/2025 13:00 |
Not measured | 47 Low (1) |
Not measured | Not measured | Not measured |
Port Talbot Margam Updated: 05/02/2025 12:00 |
21 Low (1) |
32 Low (1) |
2 Low (1) |
3 Low (1) |
20 Low (2) |
Port Talbot Prince Street 2 Updated: 05/02/2025 13:00 |
Not measured | Not measured | Not measured | 9 Low (1) |
19 Low (2) |
Rhondda Glyncoch Garth Avenue Updated: 05/02/2025 14:00 |
Not measured | Not measured | Not measured | 6 Low (1) |
13 Low (1) |
Rhondda Mountain Ash Updated: 05/02/2025 05:00 |
Not measured | No data | Not measured | Not measured | Not measured |
Rhondda Pontypridd Gelliwastad Rd Updated: 05/02/2025 05:00 |
Not measured | 23 Low (1) |
Not measured | Not measured | Not measured |
Rhondda-Cynon-Taf Broadway Updated: 05/02/2025 12:00 |
Not measured | 52 Low (1) |
Not measured | Not measured | Not measured |
Rhondda-Cynon-Taf Pontypridd A470 Updated: 05/02/2025 13:00 |
Not measured | 43 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: 30/01/2025 15:00 |
Not measured | No data | Not measured | No data | Not measured |
Swansea Roadside Updated: 05/02/2025 13:00 |
Not measured | 30 Low (1) |
Not measured | 7 Low (1) |
19 Low (2) |
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: 30/01/2025 15:00 |
Not measured | No data | Not measured | Not measured | Not measured |
Wrexham Updated: 05/02/2025 13:00 |
Not measured | 6 Low (1) |
6 Low (1) |
4 Low (1) |
8 Low (1) |
Wrexham A483 Updated: 05/02/2025 13:00 |
Not measured | 28 Low (1) |
Not measured | Not measured | Not measured |
Wrexham Chirk Updated: 05/02/2025 11:00 |
Not measured | No data | Not measured | No data | No data |
Wrexham Chirk Community Hospital Updated: 05/02/2025 13:00 |
Not measured | 9 Low (1) |
Not measured | No data | No data |