Dangosir y crynodiadau llygryddion uchaf a fesurwyd yn ystod y 24 awr diwethaf ledled Cymru isod. Mae graffiau cryno yn dangos y saith diwrnod diwethaf ar gael ar gyfer pob llygrydd yng ngholofn chwith y tabl.
Crynodeb 24 Awr
| 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 Expressway A494 Deeside |
Not measured | 39 Low (1) |
Not measured | Not measured | Not measured |
| Aston Hill |
43 Low (2) |
18 Low (1) |
Not measured | Not measured | Not measured |
| Caerphilly Islwyn Road Wattsville |
Not measured | 18 Low (1) |
Not measured | Not measured | Not measured |
| Caerphilly White Street |
Not measured | 31 Low (1) |
Not measured | Not measured | 10 Low (1) |
| Cardiff Castle Street |
Not measured | 35 Low (1) |
Not measured | 12 Low (2) |
18 Low (2) |
| Cardiff Centre |
39 Low (2) |
20 Low (1) |
1 Low (1) |
10 Low (1) |
14 Low (1) |
| Cardiff Newport Road |
Not measured | 36 Low (1) |
Not measured | Not measured | 14 Low (1) |
| Chepstow A48 |
Not measured | 36 Low (1) |
Not measured | 10 Low (1) |
14 Low (1) |
| Cimla Road / Victoria Gardens |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Cwmbran Crownbridge |
45 Low (2) |
13 Low (1) |
Not measured | Not measured | 11 Low (1) |
| Hafod-yr-ynys Hill Roadside |
Not measured | 39 Low (1) |
Not measured | Not measured | Not measured |
| Marchlyn Mawr |
67 Low (3) |
4 Low (1) |
Not measured | Not measured | Not measured |
| Nantgarw Road |
Not measured | 27 Low (1) |
Not measured | Not measured | Not measured |
| Narberth |
45 Low (2) |
7 Low (1) |
3 Low (1) |
10 Low (1) |
12 Low (1) |
| Newport M4 Junction 25 |
32 Low (1) |
21 Low (1) |
Not measured | Not measured | Not measured |
| Newport M4 Junction 25 West |
Not measured | 31 Low (1) |
Not measured | Not measured | Not measured |
| Newport St Julians Comp School |
Not measured | 20 Low (1) |
Not measured | 11 Low (1) |
15 Low (1) |
| Port Talbot Dyffryn School |
Not measured | Not measured | Not measured | 9 Low (1) |
13 Low (1) |
| Port Talbot Little Warren |
Not measured | Not measured | Not measured | 8 Low (1) |
11 Low (1) |
| Port Talbot M4 Junction 41 |
Not measured | 29 Low (1) |
Not measured | Not measured | Not measured |
| Port Talbot Margam |
50 Low (2) |
24 Low (1) |
2 Low (1) |
8 Low (1) |
15 Low (1) |
| Port Talbot Prince Street 2 |
Not measured | Not measured | Not measured | 10 Low (1) |
13 Low (1) |
| Rhondda Glyncoch Garth Avenue |
Not measured | Not measured | Not measured | 11 Low (1) |
14 Low (1) |
| Rhondda Mountain Ash |
Not measured | 14 Low (1) |
Not measured | Not measured | Not measured |
| Rhondda Pontypridd Gelliwastad Rd |
Not measured | 30 Low (1) |
Not measured | Not measured | Not measured |
| Rhondda-Cynon-Taf Broadway |
Not measured | 19 Low (1) |
Not measured | Not measured | Not measured |
| Rhondda-Cynon-Taf Pontypridd A470 |
Not measured | 31 Low (1) |
Not measured | Not measured | Not measured |
| Swansea Cwm Level Park |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Swansea Hafod DOAS |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Swansea Morfa Road NOX |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Swansea Morriston Roadside |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Swansea Port Tennant Roadside |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Swansea Roadside |
Not measured | 35 Low (1) |
Not measured | 9 Low (1) |
12 Low (1) |
| Swansea St Thomas DOAS |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Swansea Station Court High Street |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Wrexham |
Not measured | 37 Low (1) |
6 Low (1) |
20 Low (2) |
25 Low (2) |
| Wrexham A483 |
Not measured | 53 Low (1) |
Not measured | Not measured | Not measured |
| Wrexham Chirk |
Not measured | 61 Low (1) |
Not measured | 7 Low (1) |
18 Low (2) |
| Wrexham Chirk Community Hospital |
Not measured | 25 Low (1) |
Not measured | 2 Low (1) |
3 Low (1) |