This page shows a summary of the active and closed monitoring sites in Wales.
Monitoring site summary
| Monitoring site | Band/Index | Last updated |
|---|---|---|
| Aston Expressway A494 Deeside | LOW (Index 1) | 17/04/2026 16:00 |
| Aston Hill | LOW (Index 3) | 17/04/2026 14:00 |
| Caerphilly Islwyn Road Wattsville | LOW (Index 1) | 17/04/2026 16:00 |
| Caerphilly White Street | LOW (Index 1) | 17/04/2026 14:00 |
| Cardiff Castle Street | N/A | |
| Cardiff Centre | LOW (Index 3) | 17/04/2026 15:00 |
| Cardiff Newport Road | LOW (Index 3) | 17/04/2026 15:00 |
| Chepstow A48 | LOW (Index 2) | 17/04/2026 15:00 |
| Cimla Road / Victoria Gardens | LOW (Index 1) | 17/04/2026 16:00 |
| Cwmbran Crownbridge | LOW (Index 3) | 17/04/2026 16:00 |
| Hafod-yr-ynys Hill Roadside | LOW (Index 1) | 17/04/2026 15:00 |
| Marchlyn Mawr | LOW (Index 3) | 17/04/2026 15:00 |
| Nantgarw Road | LOW (Index 1) | 17/04/2026 15:00 |
| Narberth | LOW (Index 3) | 17/04/2026 15:00 |
| Newport M4 Junction 25 | LOW (Index 2) | 17/04/2026 16:00 |
| Newport M4 Junction 25 West | N/A | |
| Newport St Julians Comp School | LOW (Index 1) | 17/04/2026 15:00 |
| Port Talbot Dyffryn School | LOW (Index 1) | 17/04/2026 15:00 |
| Port Talbot Little Warren | LOW (Index 2) | 17/04/2026 15:00 |
| Port Talbot M4 Junction 41 | N/A | |
| Port Talbot Margam | LOW (Index 3) | 17/04/2026 15:00 |
| Port Talbot Prince Street 2 | LOW (Index 2) | 17/04/2026 15:00 |
| Rhondda Glyncoch Garth Avenue | N/A | |
| Rhondda Mountain Ash | LOW (Index 1) | 17/04/2026 16:00 |
| Rhondda Pontypridd Gelliwastad Rd | LOW (Index 1) | 16/04/2026 20:00 |
| Rhondda-Cynon-Taf Broadway | LOW (Index 1) | 17/04/2026 11:00 |
| Rhondda-Cynon-Taf Pontypridd A470 | LOW (Index 1) | 17/04/2026 16:00 |
| Swansea Cwm Level Park | N/A | |
| Swansea Hafod DOAS | N/A | |
| Swansea Morfa Road NOX | LOW (Index 1) | 17/04/2026 15:00 |
| Swansea Morriston Roadside | N/A | |
| Swansea Port Tennant Roadside | LOW (Index 1) | 17/04/2026 15:00 |
| Swansea Roadside | LOW (Index 2) | 17/04/2026 15:00 |
| Swansea St Thomas DOAS | N/A | |
| Swansea Station Court High Street | LOW (Index 1) | 17/04/2026 15:00 |
| Wrexham | LOW (Index 1) | 17/04/2026 15:00 |
| Wrexham A483 | LOW (Index 1) | 17/04/2026 16:00 |
| Wrexham Chirk | LOW (Index 1) | 17/04/2026 16:00 |
| Wrexham Chirk Community Hospital | LOW (Index 1) | 17/04/2026 16:00 |