Latest measured levels based on data provided by the Environment Agency
Here you can view the detailed data behind the latest measurement summary displayed on UK-AIR, and also a summary of information that has been displayed over the previous 24 hours. The detailed data tabulated below are from monitoring sites within the AURN. Graphs of hourly monitoring data are also available to view as weekly time series. You can also subscribe to this information as an email alert.
- View the legend
- Pollutant levels recorded for the hour up to 11pm Fri 18th Jul 2025
South Wales
| Latest measured levels based on data provided by the Environment Agency | ||||||
|---|---|---|---|---|---|---|
| Monitoring site | Running 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) |
Last updated |
| Cardiff Centre Timeseries Graph |
53 (2 Low) | 14 (1 Low) | 1 (1 Low) | 10 (1 Low) | 10 (1 Low) *1 | 18/07/2025 23:00:00 |
| Cardiff Newport Road Timeseries Graph |
n/m | 10 (1 Low) | n/m | n/m | 7 (1 Low) *1 | 18/07/2025 23:00:00 |
| Chepstow A48 Timeseries Graph |
n/m | 33 (1 Low) | n/m | 2 (1 Low) | 7 (1 Low) *1 | 18/07/2025 23:00:00 |
| Cwmbran Crownbridge Timeseries Graph |
61 (2 Low) | 8 (1 Low) | n/m | n/m | n/m | 18/07/2025 23:00:00 |
| Hafod-yr-ynys Hill Roadside Timeseries Graph |
n/m | 7 (1 Low) | n/m | n/m | n/m | 18/07/2025 23:00:00 |
| Narberth Timeseries Graph |
40 (2 Low) | 2 (1 Low) | 1 (1 Low) | 3 (1 Low) | 7 (1 Low) *2 | 18/07/2025 23:00:00 |
| Newport Timeseries Graph |
n/m | 10 (1 Low) | n/m | 3 (1 Low) | 8 (1 Low) *2 | 18/07/2025 23:00:00 |
| Port Talbot Margam Timeseries Graph |
54 (2 Low) | 11 (1 Low) | 1 (1 Low) | 4 (1 Low) | 9 (1 Low) *3 | 18/07/2025 23:00:00 |
| Swansea Roadside Timeseries Graph |
n/m | 19 (1 Low) | n/m | 5 (1 Low) | 9 (1 Low) *1 | 18/07/2025 23:00:00 |
» View the latest regional summary for this region
Legend
- n/m means that the pollutant is not measured at that site
- n/a means that no data were recorded for the period
- *1: measurements are PM10 BAM 1020 heated
- *2: measurements are PM10 FIDAS
- *3: measurements are PM10 SEQ 47/50