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: 10/12/2023 07:00
75
Low (3)
1
Low (1)
Not measured Not measured Not measured
Bridgend Park Street
Updated: 10/12/2023 01:00
Not measured -1
Low (1)
Not measured Not measured No Data
Caerphilly Blackwood High Street
Updated: 10/12/2023 04:00
Not measured 3
Low (1)
Not measured Not measured 14
Low (1)
Caerphilly Fochriw
Updated: 10/12/2023 06:00
Not measured Not measured Not measured 6
Low (1)
10
Low (1)
Caerphilly Islwyn Road Wattsville
Updated: 10/12/2023 06:00
Not measured 5
Low (1)
Not measured Not measured Not measured
Caerphilly White Street
Updated: 10/12/2023 04:00
Not measured 3
Low (1)
Not measured Not measured 14
Low (1)
Cardiff Castle Street
Updated: 10/12/2023 07:00
Not measured 43
Low (1)
Not measured 10
Low (1)
27
Low (2)
Cardiff Centre
Updated: 10/12/2023 07:00
67
Low (3)
12
Low (1)
1
Low (1)
12
Low (2)
24
Low (2)
Cardiff Newport Road
Updated: 10/12/2023 07:00
Not measured 9
Low (1)
Not measured Not measured 23
Low (2)
Chepstow A48
Updated: 10/12/2023 07:00
Not measured 25
Low (1)
Not measured 8
Low (1)
18
Low (2)
Cimla Road / Victoria Gardens
Updated: 10/12/2023 07:00
Not measured 4
Low (1)
Not measured Not measured Not measured
Cwmbran Crownbridge
Updated: 10/12/2023 07:00
60
Low (2)
4
Low (1)
Not measured Not measured 23
Low (2)
Hafod-yr-ynys Hill Roadside
Updated: 10/12/2023 07:00
Not measured 30
Low (1)
Not measured Not measured Not measured
Marchlyn Mawr
Updated: 10/12/2023 07:00
No Data No Data Not measured Not measured Not measured
Nantgarw Road
Updated: 10/12/2023 05:00
Not measured 6
Low (1)
Not measured Not measured Not measured
Narberth
Updated: 10/12/2023 07:00
88
Low (3)
1
Low (1)
3
Low (1)
9
Low (1)
17
Low (2)
Newport M4 Junction 25
Updated: 10/12/2023 07:00
45
Low (2)
45
Low (1)
Not measured Not measured Not measured
Newport St Julians Comp School
Updated: 10/12/2023 07:00
Not measured 6
Low (1)
Not measured 8
Low (1)
18
Low (2)
Port Talbot Dyffryn School
Updated: 10/12/2023 07:00
Not measured Not measured Not measured 12
Low (2)
30
Low (2)
Port Talbot Little Warren
Updated: 08/12/2023 22:00
Not measured Not measured Not measured No Data No Data
Port Talbot Margam
Updated: 10/12/2023 07:00
74
Low (3)
12
Low (1)
26
Low (1)
10
Low (1)
36
Low (3)
Port Talbot Prince Street 2
Updated: 10/12/2023 07:00
Not measured Not measured Not measured 15
Low (2)
40
Low (3)
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: 10/11/2023 08:00
Not measured Not measured Not measured No Data No Data
Rhondda Mountain Ash
Updated: 09/12/2023 21:00
Not measured No Data Not measured Not measured Not measured
Rhondda Pontypridd Gelliwastad Rd
Updated: 09/12/2023 18:00
Not measured 29
Low (1)
Not measured Not measured Not measured
Rhondda-Cynon-Taf Broadway
Updated: 10/12/2023 07:00
Not measured 10
Low (1)
Not measured Not measured Not measured
Swansea Cwm Level Park
Updated: 10/12/2023 06:00
55
Low (2)
7
Low (1)
Not measured Not measured Not measured
Swansea Hafod DOAS
Updated: 10/12/2023 06:00
63
Low (2)
67
Low (1)
Not measured Not measured Not measured
Swansea Morfa Road NOX
Updated: 11/11/2023 11:00
Not measured No Data Not measured Not measured Not measured
Swansea Morriston Roadside
Updated: 18/10/2023 16:00
No Data No Data Not measured No Data Not measured
Swansea Port Tennant Roadside
Updated: 10/11/2023 15:00
Not measured No Data Not measured No Data Not measured
Swansea Roadside
Updated: 10/12/2023 07:00
Not measured 21
Low (1)
Not measured 8
Low (1)
28
Low (2)
Swansea St Thomas DOAS
Updated: 10/12/2023 06:00
65
Low (2)
4
Low (1)
2
Low (1)
Not measured Not measured
Swansea Station Court High Street
Updated: 08/12/2023 14:00
Not measured No Data 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: 10/12/2023 07:00
Not measured 12
Low (1)
3
Low (1)
6
Low (1)
10
Low (1)
Wrexham Chirk
Updated: 10/12/2023 07:00
Not measured 12
Low (1)
Not measured 10
Low (1)
21
Low (2)
Wrexham Chirk Community Hospital
Updated: 10/12/2023 07:00
Not measured 32
Low (1)
Not measured 11
Low (1)
17
Low (2)