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 | 54 Low (1) |
Not measured | Not measured | Not measured |
| Aston Hill |
53 Low (2) |
17 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 | 19 Low (2) |
| Cardiff Castle Street |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Cardiff Centre |
49 Low (2) |
26 Low (1) |
2 Low (1) |
19 Low (2) |
17 Low (2) |
| Cardiff Newport Road |
Not measured | 29 Low (1) |
Not measured | Not measured | 18 Low (2) |
| Chepstow A48 |
Not measured | 32 Low (1) |
Not measured | 17 Low (2) |
15 Low (1) |
| Cimla Road / Victoria Gardens |
Not measured | 43 Low (1) |
Not measured | Not measured | Not measured |
| Cwmbran Crownbridge |
50 Low (2) |
15 Low (1) |
Not measured | Not measured | 11 Low (1) |
| Hafod-yr-ynys Hill Roadside |
Not measured | 46 Low (1) |
Not measured | Not measured | Not measured |
| Marchlyn Mawr |
75 Low (3) |
7 Low (1) |
Not measured | Not measured | Not measured |
| Nantgarw Road |
Not measured | 29 Low (1) |
Not measured | Not measured | Not measured |
| Narberth |
53 Low (2) |
8 Low (1) |
2 Low (1) |
15 Low (2) |
17 Low (2) |
| Newport M4 Junction 25 |
23 Low (1) |
23 Low (1) |
Not measured | Not measured | Not measured |
| Newport St Julians Comp School |
Not measured | 20 Low (1) |
Not measured | 18 Low (2) |
21 Low (2) |
| Port Talbot Dyffryn School |
Not measured | Not measured | Not measured | 9 Low (1) |
8 Low (1) |
| Port Talbot Little Warren |
Not measured | Not measured | Not measured | 9 Low (1) |
7 Low (1) |
| Port Talbot M4 Junction 41 |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Port Talbot Margam |
66 Low (2) |
30 Low (1) |
2 Low (1) |
11 Low (1) |
12 Low (1) |
| Port Talbot Prince Street 2 |
Not measured | Not measured | Not measured | 10 Low (1) |
10 Low (1) |
| Rhondda Glyncoch Garth Avenue |
Not measured | Not measured | Not measured | 15 Low (2) |
17 Low (2) |
| Rhondda Mountain Ash |
Not measured | 17 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 | 22 Low (1) |
Not measured | Not measured | Not measured |
| Rhondda-Cynon-Taf Pontypridd A470 |
Not measured | Not measured | 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 | 45 Low (1) |
Not measured | Not measured | Not measured |
| Swansea Morriston Roadside |
Not measured | 38 Low (1) |
Not measured | Not measured | Not measured |
| Swansea Port Tennant Roadside |
Not measured | 41 Low (1) |
Not measured | 10 Low (1) |
Not measured |
| Swansea Roadside |
Not measured | 50 Low (1) |
Not measured | 13 Low (2) |
14 Low (1) |
| Swansea St Thomas DOAS |
Not measured | Not measured | Not measured | Not measured | Not measured |
| Swansea Station Court High Street |
Not measured | 58 Low (1) |
Not measured | Not measured | Not measured |
| Wrexham |
Not measured | 43 Low (1) |
4 Low (1) |
20 Low (2) |
27 Low (2) |
| Wrexham A483 |
Not measured | 48 Low (1) |
Not measured | Not measured | Not measured |
| Wrexham Chirk |
Not measured | 69 Low (2) |
Not measured | 2 Low (1) |
3 Low (1) |
| Wrexham Chirk Community Hospital |
Not measured | 25 Low (1) |
Not measured | 6 Low (1) |
10 Low (1) |