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: 20/09/2021 10:00
Not measured Not measured Not measured 3
Low (1)
25
Low (2)
Anglesey Llynfaes
Updated: 20/09/2021 10:00
Not measured Not measured Not measured 3
Low (1)
12
Low (1)
Anglesey Penhesgyn 3
Updated: 20/09/2021 10:00
Not measured Not measured Not measured 4
Low (1)
9
Low (1)
Aston Hill
Updated: 20/09/2021 11:00
53
Low (2)
No Data Not measured Not measured Not measured
Bridgend Park Street
Updated: 20/09/2021 05:00
Not measured No Data Not measured Not measured 12
Low (1)
Caerphilly Blackwood High Street
Updated: 20/09/2021 07:00
Not measured 16
Low (1)
Not measured Not measured 13
Low (1)
Caerphilly Fochriw
Updated: 20/09/2021 09:00
Not measured Not measured Not measured 3
Low (1)
6
Low (1)
Caerphilly Islwyn Road Wattsville
Updated: 20/09/2021 11:00
Not measured 14
Low (1)
Not measured Not measured Not measured
Caerphilly White Street
Updated: 20/09/2021 07:00
Not measured 42
Low (1)
Not measured Not measured 10
Low (1)
Cardiff Castle Street
Updated: 20/09/2021 11:00
Not measured 13
Low (1)
Not measured 4
Low (1)
11
Low (1)
Cardiff Centre
Updated: 20/09/2021 11:00
14
Low (1)
7
Low (1)
2
Low (1)
4
Low (1)
10
Low (1)
Cardiff Newport Road
Updated: 20/09/2021 11:00
Not measured 21
Low (1)
Not measured Not measured 18
Low (2)
Chepstow A48
Updated: 20/09/2021 11:00
Not measured 31
Low (1)
Not measured 6
Low (1)
6
Low (1)
Cimla Road / Victoria Gardens
Updated: 20/09/2021 06:00
Not measured 24
Low (1)
Not measured Not measured Not measured
Cwmbran Crownbridge
Updated: 20/09/2021 11:00
23
Low (1)
2
Low (1)
Not measured Not measured 9
Low (1)
Hafod-yr-ynys Roadside
Updated: 20/09/2021 11:00
Not measured 59
Low (1)
Not measured Not measured Not measured
Marchlyn Mawr
Updated: 20/09/2021 11:00
54
Low (2)
1
Low (1)
Not measured Not measured Not measured
Nantgarw Road
Updated: 16/09/2021 20:00
Not measured Not measured Not measured Not measured Not measured
Narberth
Updated: 20/09/2021 11:00
32
Low (1)
2
Low (1)
2
Low (1)
3
Low (1)
6
Low (1)
Newport M4 Junction 25
Updated: 20/09/2021 11:00
11
Low (1)
16
Low (1)
Not measured Not measured Not measured
Newport St Julians Comp School
Updated: 20/09/2021 11:00
Not measured 13
Low (1)
Not measured 3
Low (1)
6
Low (1)
Port Talbot Dyffryn School
Updated: 20/01/2021 22:00
Not measured Not measured Not measured Not measured Not measured
Port Talbot Little Warren
Updated: 20/09/2021 11:00
Not measured Not measured Not measured Not measured No Data
Port Talbot Margam
Updated: 20/09/2021 11:00
23
Low (1)
4
Low (1)
2
Low (1)
4
Low (1)
11
Low (1)
Port Talbot Prince Street 2
Updated: 22/07/2021 16:00
Not measured Not measured Not measured Not measured Not measured
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: 20/09/2021 11:00
Not measured Not measured Not measured Not measured 4
Low (1)
Rhondda Mountain Ash
Updated: 20/09/2021 07:00
Not measured 49
Low (1)
Not measured Not measured Not measured
Rhondda Pontypridd Gelliwastad Rd
Updated: 18/09/2021 06:00
Not measured Not measured Not measured Not measured Not measured
Rhondda-Cynon-Taf Broadway
Updated: 20/09/2021 11:00
Not measured 16
Low (1)
Not measured Not measured Not measured
Swansea Cwm Level Park
Updated: 19/09/2021 16:00
Not measured Not measured Not measured Not measured Not measured
Swansea Hafod DOAS
Updated: 19/09/2021 16:00
Not measured Not measured Not measured Not measured Not measured
Swansea Morfa Road NOX
Updated: 19/09/2021 16:00
Not measured Not measured Not measured Not measured Not measured
Swansea Morriston Roadside
Updated: 01/07/2021 07:00
Not measured Not measured Not measured Not measured Not measured
Swansea Port Tennant Roadside
Updated: 19/09/2021 16:00
Not measured Not measured Not measured Not measured Not measured
Swansea Roadside
Updated: 20/09/2021 11:00
Not measured 1
Low (1)
Not measured 11
Low (1)
13
Low (1)
Swansea St Thomas DOAS
Updated: 19/09/2021 16:00
Not measured Not measured Not measured Not measured Not measured
Swansea Station Court High Street
Updated: 19/09/2021 16:00
Not measured Not measured 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: 20/09/2021 11:00
Not measured 8
Low (1)
No Data 3
Low (1)
6
Low (1)
Wrexham Chirk
Updated: 27/01/2021 01:00
Not measured 19
Low (1)
Not measured 3
Low (1)
8
Low (1)