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
Anglesey Brynteg
Updated: 03/01/2023 17:00
Not measured Not measured Not measured Not measured Not measured
Anglesey Llynfaes
Updated: 15/01/2022 24:00
Not measured Not measured Not measured Not measured Not measured
Anglesey Penhesgyn 3
Updated: 03/04/2022 24:00
Not measured Not measured Not measured Not measured Not measured
Aston Hill
Updated: 03/02/2023 10:00
56
Low (2)
1
Low (1)
Not measured Not measured Not measured
Bridgend Park Street
Updated: 03/02/2023 08:00
Not measured 29
Low (1)
Not measured Not measured 17
Low (2)
Caerphilly Blackwood High Street
Updated: 03/02/2023 08:00
Not measured 23
Low (1)
Not measured Not measured No Data
Caerphilly Fochriw
Updated: 03/02/2023 08:00
Not measured Not measured Not measured 2
Low (1)
5
Low (1)
Caerphilly Islwyn Road Wattsville
Updated: 03/02/2023 09:00
Not measured 39
Low (1)
Not measured Not measured Not measured
Caerphilly White Street
Updated: 03/02/2023 08:00
Not measured 24
Low (1)
Not measured Not measured 13
Low (1)
Cardiff Castle Street
Updated: 03/02/2023 09:00
Not measured 33
Low (1)
Not measured 4
Low (1)
10
Low (1)
Cardiff Centre
Updated: 02/02/2023 07:00
69
Low (3)
No Data 2
Low (1)
5
Low (1)
11
Low (1)
Cardiff Newport Road
Updated: 03/02/2023 10:00
Not measured 12
Low (1)
Not measured Not measured 10
Low (1)
Chepstow A48
Updated: 03/02/2023 10:00
Not measured 52
Low (1)
Not measured 7
Low (1)
13
Low (1)
Cimla Road / Victoria Gardens
Updated: 03/02/2023 10:00
Not measured 53
Low (1)
Not measured Not measured Not measured
Cwmbran Crownbridge
Updated: 03/02/2023 10:00
73
Low (3)
6
Low (1)
Not measured Not measured 7
Low (1)
Hafod-yr-ynys Roadside
Updated: 01/02/2023 04:00
Not measured Not measured Not measured Not measured Not measured
Marchlyn Mawr
Updated: 03/02/2023 10:00
69
Low (3)
1
Low (1)
Not measured Not measured Not measured
Nantgarw Road
Updated: 03/02/2023 10:00
Not measured 33
Low (1)
Not measured Not measured Not measured
Narberth
Updated: 03/02/2023 10:00
75
Low (3)
2
Low (1)
1
Low (1)
4
Low (1)
8
Low (1)
Newport M4 Junction 25
Updated: 03/02/2023 10:00
38
Low (2)
64
Low (1)
Not measured Not measured Not measured
Newport St Julians Comp School
Updated: 03/02/2023 10:00
Not measured 23
Low (1)
Not measured 5
Low (1)
7
Low (1)
Port Talbot Dyffryn School
Updated: 03/02/2023 10:00
Not measured Not measured Not measured 6
Low (1)
19
Low (2)
Port Talbot Little Warren
Updated: 03/02/2023 10:00
Not measured Not measured Not measured 5
Low (1)
17
Low (2)
Port Talbot Margam
Updated: 03/02/2023 10:00
74
Low (3)
10
Low (1)
1
Low (1)
5
Low (1)
21
Low (2)
Port Talbot Prince Street 2
Updated: 03/02/2023 10:00
Not measured Not measured Not measured 12
Low (2)
45
Low (3)
Port Talbot Twll-yn-y-Wal Park
Updated: 18/03/2021 12:00
Not measured Not measured Not measured Not measured Not measured
Rhondda Glyncoch Garth Avenue
Updated: 28/01/2023 01:00
Not measured Not measured Not measured Not measured Not measured
Rhondda Mountain Ash
Updated: 03/02/2023 08:00
Not measured 54
Low (1)
Not measured Not measured Not measured
Rhondda Pontypridd Gelliwastad Rd
Updated: 03/02/2023 07:00
Not measured 55
Low (1)
Not measured Not measured Not measured
Rhondda-Cynon-Taf Broadway
Updated: 03/02/2023 07:00
Not measured 29
Low (1)
Not measured Not measured Not measured
Swansea Cwm Level Park
Updated: 03/02/2023 09:00
83
Low (3)
12
Low (1)
Not measured Not measured Not measured
Swansea Hafod DOAS
Updated: 03/02/2023 09:00
80
Low (3)
32
Low (1)
Not measured Not measured Not measured
Swansea Morfa Road NOX
Updated: 01/02/2023 22:00
Not measured Not measured Not measured Not measured Not measured
Swansea Morriston Roadside
Updated: 03/01/2023 12:00
Not measured Not measured Not measured Not measured Not measured
Swansea Port Tennant Roadside
Updated: 03/02/2023 07:00
Not measured 14
Low (1)
Not measured No Data Not measured
Swansea Roadside
Updated: 03/02/2023 10:00
Not measured 16
Low (1)
Not measured 5
Low (1)
12
Low (1)
Swansea St Thomas DOAS
Updated: 03/02/2023 09:00
68
Low (3)
25
Low (1)
1
Low (1)
Not measured Not measured
Swansea Station Court High Street
Updated: 03/02/2023 08:00
Not measured 37
Low (1)
Not measured Not measured Not measured
Twynyrodyn
Updated: 02/07/2019 24:00
Not measured Not measured Not measured Not measured Not measured
Wrexham
Updated: 03/02/2023 10:00
Not measured 9
Low (1)
1
Low (1)
2
Low (1)
5
Low (1)
Wrexham Chirk
Updated: 03/02/2023 10:00
Not measured 28
Low (1)
Not measured 3
Low (1)
7
Low (1)
Wrexham Chirk Community Hospital
Updated: 03/02/2023 10:00
Not measured 14
Low (1)
Not measured 3
Low (1)
4
Low (1)