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: 05/10/2024 20:00
Not measured No data Not measured Not measured Not measured
Aston Hill
Updated: 08/10/2024 11:00
65
Low (2)
1
Low (1)
Not measured Not measured Not measured
Bridgend Park Street
Updated: 22/07/2024 10:00
Not measured No data Not measured Not measured No data
Caerphilly Blackwood High Street
Updated: 08/10/2024 07:00
Not measured 25
Low (1)
Not measured Not measured 14
Low (1)
Caerphilly Fochriw
Updated: 08/10/2024 09:00
Not measured Not measured Not measured 2
Low (1)
10
Low (1)
Caerphilly Islwyn Road Wattsville
Updated: 08/10/2024 08:00
Not measured 17
Low (1)
Not measured Not measured Not measured
Caerphilly White Street
Updated: 08/10/2024 07:00
Not measured 19
Low (1)
Not measured Not measured 18
Low (2)
Cardiff Castle Street
Updated: 08/10/2024 10:00
Not measured 62
Low (1)
Not measured 7
Low (1)
18
Low (2)
Cardiff Centre
Updated: 08/10/2024 11:00
57
Low (2)
16
Low (1)
2
Low (1)
6
Low (1)
11
Low (1)
Cardiff Newport Road
Updated: 08/10/2024 11:00
Not measured 34
Low (1)
Not measured Not measured 17
Low (2)
Chepstow A48
Updated: 08/10/2024 09:00
Not measured No data Not measured 4
Low (1)
13
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: 08/10/2024 11:00
53
Low (2)
6
Low (1)
Not measured Not measured 13
Low (1)
Hafod-yr-ynys Hill Roadside
Updated: 08/10/2024 11:00
Not measured 44
Low (1)
Not measured Not measured Not measured
Marchlyn Mawr
Updated: 08/10/2024 10:00
No data 1
Low (1)
Not measured Not measured Not measured
Nantgarw Road
Updated: 08/10/2024 09:00
Not measured 16
Low (1)
Not measured Not measured Not measured
Narberth
Updated: 08/10/2024 11:00
74
Low (3)
2
Low (1)
4
Low (1)
5
Low (1)
10
Low (1)
Newport M4 Junction 25
Updated: 08/10/2024 11:00
17
Low (1)
41
Low (1)
Not measured Not measured Not measured
Newport M4 Junction 25 West
Updated: 25/08/2024 12:00
Not measured No data Not measured Not measured Not measured
Newport St Julians Comp School
Updated: 08/10/2024 11:00
Not measured 7
Low (1)
Not measured 5
Low (1)
11
Low (1)
Port Talbot Dyffryn School
Updated: 08/10/2024 10:00
Not measured Not measured Not measured 6
Low (1)
11
Low (1)
Port Talbot Little Warren
Updated: 08/10/2024 10:00
Not measured Not measured Not measured 5
Low (1)
14
Low (1)
Port Talbot M4 Junction 41
Updated: 08/10/2024 10:00
Not measured 20
Low (1)
Not measured Not measured Not measured
Port Talbot Margam
Updated: 08/10/2024 11:00
73
Low (3)
7
Low (1)
0
Low (1)
2
Low (1)
13
Low (1)
Port Talbot Prince Street 2
Updated: 08/10/2024 10:00
Not measured Not measured Not measured 5
Low (1)
12
Low (1)
Rhondda Glyncoch Garth Avenue
Updated: 08/10/2024 11:00
Not measured Not measured Not measured 8
Low (1)
41
Low (3)
Rhondda Mountain Ash
Updated: 08/10/2024 07:00
Not measured 57
Low (1)
Not measured Not measured Not measured
Rhondda Pontypridd Gelliwastad Rd
Updated: 08/10/2024 06:00
Not measured 40
Low (1)
Not measured Not measured Not measured
Rhondda-Cynon-Taf Broadway
Updated: 07/10/2024 04:00
Not measured No data Not measured Not measured Not measured
Rhondda-Cynon-Taf Pontypridd A470
Updated: 08/10/2024 10:00
Not measured 28
Low (1)
Not measured Not measured Not measured
Swansea Cwm Level Park
Updated: 08/10/2024 10:00
42
Low (2)
21
Low (1)
Not measured Not measured Not measured
Swansea Hafod DOAS
Updated: 08/10/2024 10:00
61
Low (2)
26
Low (1)
Not measured Not measured Not measured
Swansea Morfa Road NOX
Updated: 23/08/2024 04:00
Not measured No data Not measured Not measured Not measured
Swansea Morriston Roadside
Updated: 27/09/2024 15:00
No data No data Not measured No data Not measured
Swansea Port Tennant Roadside
Updated: 04/10/2024 10:00
Not measured No data Not measured 17
Low (2)
Not measured
Swansea Roadside
Updated: 08/10/2024 11:00
Not measured 18
Low (1)
Not measured 4
Low (1)
14
Low (1)
Swansea St Thomas DOAS
Updated: 08/10/2024 10:00
69
Low (3)
22
Low (1)
2
Low (1)
Not measured Not measured
Swansea Station Court High Street
Updated: 08/10/2024 09:00
Not measured 25
Low (1)
Not measured Not measured Not measured
Wrexham
Updated: 08/10/2024 11:00
Not measured 11
Low (1)
3
Low (1)
7
Low (1)
13
Low (1)
Wrexham A483
Updated: 08/10/2024 10:00
Not measured 13
Low (1)
Not measured Not measured Not measured
Wrexham Chirk
Updated: 08/10/2024 10:00
Not measured 23
Low (1)
Not measured 6
Low (1)
20
Low (2)
Wrexham Chirk Community Hospital
Updated: 08/10/2024 10:00
Not measured 24
Low (1)
Not measured 7
Low (1)
16
Low (1)