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: 20/04/2021 10:00
Not measured Not measured Not measured 9
Low (1)
18
Low (2)
Anglesey Llynfaes
Updated: 20/04/2021 10:00
Not measured Not measured Not measured 7
Low (1)
14
Low (1)
Anglesey Penhesgyn 3
Updated: 20/04/2021 10:00
Not measured Not measured Not measured 7
Low (1)
14
Low (1)
Aston Hill
Updated: 20/04/2021 13:00
96
Low (3)
12
Low (1)
Not measured Not measured Not measured
Bridgend Park Street
Updated: 20/04/2021 12:00
Not measured 32
Low (1)
Not measured Not measured 24
Low (2)
Caerphilly Blackwood High Street
Updated: 20/04/2021 12:00
Not measured 30
Low (1)
Not measured Not measured 33
Low (2)
Caerphilly Fochriw
Updated: 20/04/2021 11:00
Not measured Not measured Not measured 17
Low (2)
25
Low (2)
Caerphilly Islwyn Road Wattsville
Updated: 20/04/2021 11:00
Not measured 15
Low (1)
Not measured Not measured Not measured
Caerphilly White Street
Updated: 20/04/2021 12:00
Not measured 26
Low (1)
Not measured Not measured 24
Low (2)
Cardiff Castle Street
Updated: 20/04/2021 13:00
Not measured 47
Low (1)
Not measured 18
Low (2)
32
Low (2)
Cardiff Centre
Updated: 20/04/2021 13:00
53
Low (2)
22
Low (1)
2
Low (1)
18
Low (2)
26
Low (2)
Cardiff Newport Road
Updated: 20/04/2021 13:00
Not measured 47
Low (1)
Not measured Not measured 34
Low (3)
Chepstow A48
Updated: 20/04/2021 13:00
Not measured 30
Low (1)
Not measured 21
Low (2)
30
Low (2)
Cimla Road / Victoria Gardens
Updated: 20/04/2021 06:00
Not measured 20
Low (1)
Not measured Not measured Not measured
Cwmbran Crownbridge
Updated: 20/04/2021 13:00
70
Low (3)
9
Low (1)
Not measured Not measured 22
Low (2)
Hafod-yr-ynys Roadside
Updated: 20/04/2021 13:00
Not measured 44
Low (1)
Not measured Not measured Not measured
Marchlyn Mawr
Updated: 20/04/2021 13:00
108
Moderate (4)
8
Low (1)
Not measured Not measured Not measured
Nantgarw Road
Updated: 20/04/2021 04:00
Not measured 16
Low (1)
Not measured Not measured Not measured
Narberth
Updated: 20/04/2021 13:00
91
Low (3)
3
Low (1)
8
Low (1)
16
Low (2)
23
Low (2)
Newport M4 Junction 25
Updated: 20/04/2021 13:00
38
Low (2)
47
Low (1)
Not measured Not measured Not measured
Newport St Julians Comp School
Updated: 20/04/2021 13:00
Not measured 15
Low (1)
Not measured 15
Low (2)
25
Low (2)
Port Talbot Dyffryn School
Updated: 20/04/2021 12:00
Not measured Not measured Not measured Not measured 40
Low (3)
Port Talbot Little Warren
Updated: 20/04/2021 13:00
Not measured Not measured Not measured Not measured 29
Low (2)
Port Talbot Margam
Updated: 20/04/2021 13:00
50
Low (2)
27
Low (1)
20
Low (1)
23
Low (2)
59
Moderate (5)
Port Talbot Prince Street 2
Updated: 20/04/2021 13:00
Not measured Not measured Not measured 23
Low (2)
52
Moderate (4)
Port Talbot Twll-yn-y-Wal Park
Updated: -
Not measured Not measured Not measured Not measured Not measured
Rhondda Glyncoch Garth Avenue
Updated: 20/04/2021 13:00
Not measured Not measured Not measured Not measured 27
Low (2)
Rhondda Mountain Ash
Updated: 20/04/2021 12:00
Not measured 36
Low (1)
Not measured Not measured Not measured
Rhondda Pontypridd Gelliwastad Rd
Updated: 20/04/2021 06:00
Not measured 32
Low (1)
Not measured Not measured Not measured
Rhondda-Cynon-Taf Broadway
Updated: 20/04/2021 11:00
Not measured 26
Low (1)
Not measured Not measured Not measured
Swansea Cwm Level Park
Updated: 20/04/2021 12:00
No Data 14
Low (1)
Not measured Not measured Not measured
Swansea Hafod DOAS
Updated: 20/04/2021 12:00
47
Low (2)
12
Low (1)
Not measured Not measured Not measured
Swansea Morfa Road NOX
Updated: 20/04/2021 12:00
Not measured 24
Low (1)
Not measured Not measured Not measured
Swansea Morriston Roadside
Updated: 16/04/2021 09:00
Not measured Not measured Not measured Not measured Not measured
Swansea Port Tennant Roadside
Updated: 20/04/2021 12:00
Not measured 20
Low (1)
Not measured 21
Low (2)
Not measured
Swansea Roadside
Updated: 20/04/2021 13:00
Not measured 15
Low (1)
Not measured 21
Low (2)
35
Low (3)
Swansea St Thomas DOAS
Updated: 20/04/2021 12:00
46
Low (2)
18
Low (1)
2
Low (1)
Not measured Not measured
Swansea Station Court High Street
Updated: 20/04/2021 12:00
Not measured 72
Low (2)
Not measured Not measured Not measured
Twynyrodyn
Updated: -
Not measured Not measured Not measured Not measured Not measured
Wrexham
Updated: 20/04/2021 13:00
Not measured 30
Low (1)
4
Low (1)
21
Low (2)
32
Low (2)
Wrexham Chirk
Updated: 20/04/2021 13:00
Not measured 26
Low (1)
Not measured 5
Low (1)
15
Low (1)