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 Hill
Updated: 18/05/2024 03:00
77
Low (3)
5
Low (1)
Not measured Not measured Not measured
Bridgend Park Street
Updated: 17/05/2024 19:00
Not measured 31
Low (1)
Not measured Not measured 11
Low (1)
Caerphilly Blackwood High Street
Updated: 17/05/2024 22:00
Not measured 24
Low (1)
Not measured Not measured 13
Low (1)
Caerphilly Fochriw
Updated: 18/05/2024 01:00
Not measured Not measured Not measured 6
Low (1)
9
Low (1)
Caerphilly Islwyn Road Wattsville
Updated: 17/05/2024 20:00
Not measured No Data Not measured Not measured Not measured
Caerphilly White Street
Updated: 17/05/2024 22:00
Not measured 31
Low (1)
Not measured Not measured 8
Low (1)
Cardiff Castle Street
Updated: 18/05/2024 02:00
Not measured 44
Low (1)
Not measured 9
Low (1)
17
Low (2)
Cardiff Centre
Updated: 18/05/2024 03:00
41
Low (2)
21
Low (1)
1
Low (1)
9
Low (1)
12
Low (1)
Cardiff Newport Road
Updated: 18/05/2024 03:00
Not measured 28
Low (1)
Not measured Not measured 15
Low (1)
Chepstow A48
Updated: 18/05/2024 02:00
Not measured 13
Low (1)
Not measured 6
Low (1)
14
Low (1)
Cimla Road / Victoria Gardens
Updated: 15/05/2024 06:00
Not measured No Data Not measured Not measured Not measured
Cwmbran Crownbridge
Updated: 17/05/2024 24:00
43
Low (2)
No Data Not measured Not measured No Data
Hafod-yr-ynys Hill Roadside
Updated: 18/05/2024 02:00
Not measured 6
Low (1)
Not measured Not measured Not measured
Marchlyn Mawr
Updated: 18/05/2024 02:00
No Data 1
Low (1)
Not measured Not measured Not measured
Nantgarw Road
Updated: 16/05/2024 24:00
Not measured No Data Not measured Not measured Not measured
Narberth
Updated: 18/05/2024 03:00
67
Low (3)
3
Low (1)
1
Low (1)
4
Low (1)
6
Low (1)
Newport M4 Junction 25
Updated: 18/05/2024 02:00
31
Low (1)
9
Low (1)
Not measured Not measured Not measured
Newport St Julians Comp School
Updated: 18/05/2024 03:00
Not measured 11
Low (1)
Not measured 6
Low (1)
11
Low (1)
Port Talbot Dyffryn School
Updated: 18/05/2024 02:00
Not measured Not measured Not measured 10
Low (1)
10
Low (1)
Port Talbot Little Warren
Updated: 18/05/2024 02:00
Not measured Not measured Not measured 7
Low (1)
12
Low (1)
Port Talbot Margam
Updated: 18/05/2024 03:00
51
Low (2)
5
Low (1)
1
Low (1)
6
Low (1)
17
Low (2)
Port Talbot Prince Street 2
Updated: 18/05/2024 02:00
Not measured Not measured Not measured 5
Low (1)
16
Low (1)
Port Talbot Twll-yn-y-Wal Park
Updated: 18/03/2021 12:00
Not measured Not measured Not measured Not measured No Data
Rhondda Glyncoch Garth Avenue
Updated: 18/05/2024 02:00
Not measured Not measured Not measured 8
Low (1)
31
Low (2)
Rhondda Mountain Ash
Updated: 17/05/2024 20:00
Not measured 46
Low (1)
Not measured Not measured Not measured
Rhondda Pontypridd Gelliwastad Rd
Updated: 17/05/2024 14:00
Not measured 36
Low (1)
Not measured Not measured Not measured
Rhondda-Cynon-Taf Broadway
Updated: 17/05/2024 19:00
Not measured No Data Not measured Not measured Not measured
Swansea Cwm Level Park
Updated: 18/05/2024 01:00
56
Low (2)
13
Low (1)
Not measured Not measured Not measured
Swansea Hafod DOAS
Updated: 18/05/2024 01:00
45
Low (2)
37
Low (1)
Not measured Not measured Not measured
Swansea Morfa Road NOX
Updated: 16/05/2024 10:00
Not measured No Data Not measured Not measured Not measured
Swansea Morriston Roadside
Updated: 17/05/2024 11:00
44
Low (2)
10
Low (1)
Not measured No Data Not measured
Swansea Port Tennant Roadside
Updated: 17/05/2024 13:00
Not measured 10
Low (1)
Not measured No Data Not measured
Swansea Roadside
Updated: 18/05/2024 03:00
Not measured 6
Low (1)
Not measured 7
Low (1)
13
Low (1)
Swansea St Thomas DOAS
Updated: 18/05/2024 01:00
58
Low (2)
68
Low (2)
4
Low (1)
Not measured Not measured
Swansea Station Court High Street
Updated: 17/05/2024 14:00
Not measured 24
Low (1)
Not measured Not measured Not measured
Twynyrodyn
Updated: 02/07/2019 24:00
Not measured Not measured Not measured No Data No Data
Wrexham
Updated: 18/05/2024 02:00
Not measured 6
Low (1)
1
Low (1)
8
Low (1)
12
Low (1)
Wrexham Chirk
Updated: 18/05/2024 02:00
Not measured 12
Low (1)
Not measured 2
Low (1)
12
Low (1)
Wrexham Chirk Community Hospital
Updated: 18/05/2024 02:00
Not measured 9
Low (1)
Not measured 2
Low (1)
11
Low (1)