What's the air quality in Sir Gaerfyrddin / Carmarthenshire? NO₂ 4.0 µg/m³
In 2025 the average resident of Sir Gaerfyrddin / Carmarthenshire lived with background NO₂ of 4.0 µg/m³, Very Low for England and Wales and below the WHO guideline of 10. PM2.5 was 5.4 µg/m³, Very Low for England and Wales and 1.1 times the WHO guideline of 5. The typical area in England and Wales has NO₂ of 7.2 and PM2.5 of 7.4 µg/m³.
- PM2.5
- 5.4 µg/m³
- NO₂ for England and Wales
- Very Low
- Figures for
- 2025 annual average
Modelled background levels averaged over where residents live (Census 2021), not roadside levels. Contains public sector information licensed under the Open Government Licence v3.0. Source: Defra modelled background pollution, 2025. How we calculate this
All house prices in Sir Gaerfyrddin / CarmarthenshireIs the air quality good in Sir Gaerfyrddin / Carmarthenshire?
Background NO₂ in Sir Gaerfyrddin / Carmarthenshire is 4.0 µg/m³, below the WHO guideline of 10, and lower than the typical area (7.2). That puts it in the Very Low band. Background PM2.5 in Sir Gaerfyrddin / Carmarthenshire is 5.4 µg/m³, 1.1 times the WHO guideline of 5, and lower than the typical area (7.4). That puts it in the Very Low band. Most of England and Wales is above the WHO guideline for PM2.5, so the bands compare places with each other rather than giving a pass or fail.
Nitrogen dioxide (NO₂): 4.0 µg/m³
NO₂ level is Very Low, on a scale from Very Low to Very High.
Very Low means the lowest fifth of areas in England and Wales for NO₂.
| Very Low | up to 4.7 |
|---|---|
| Low | 4.7 to 6.5 |
| Typical | 6.5 to 7.7 |
| High | 7.7 to 9.2 |
| Very High | over 9.2 |
WHO guideline: 10 µg/m³ (in the Very High band). UK legal limit: 40 µg/m³.
Fine particles (PM2.5): 5.4 µg/m³
PM2.5 level is Very Low, on a scale from Very Low to Very High.
Very Low means the lowest fifth of areas in England and Wales for PM2.5.
| Very Low | up to 6.0 |
|---|---|
| Low | 6.0 to 7.2 |
| Typical | 7.2 to 7.7 |
| High | 7.7 to 8.2 |
| Very High | over 8.2 |
WHO guideline: 5 µg/m³ (in the Very Low band). UK legal limit: 20 µg/m³, with a target of 10 µg/m³ in England by 2040.
The bands split every area we cover into fifths by its level, from Very Low to Very High. The map uses the same colours.
Which part of Sir Gaerfyrddin / Carmarthenshire has the cleanest air?
Llanddeusant has the lowest background NO₂ of the 72 areas of Sir Gaerfyrddin / Carmarthenshire, at 2.1 µg/m³. Llanelli has the highest, at 5.5 µg/m³. Average house prices are shown alongside, so you can weigh air quality against cost.
| Area | NO₂ | PM2.5 | NO₂ band | Average price |
|---|---|---|---|---|
| LlanddeusantVery Low | 2.1 | 4.4 | Very Low | £421,000 |
| LlanllwniVery Low | 2.1 | 4.5 | Very Low | £322,166 |
| LlanycrwysVery Low | 2.1 | 4.4 | Very Low | £207,250 |
| Cynwyl GaeoVery Low | 2.2 | 4.4 | Very Low | £511,250 |
| Llanfihangel Rhos-y-CornVery Low | 2.2 | 4.5 | Very Low | £232,500 |
| LlanybydderVery Low | 2.2 | 4.5 | Very Low | £272,431 |
| Llanfihangel-ar-ArthVery Low | 2.2 | 4.6 | Very Low | £286,850 |
| PencarregVery Low | 2.2 | 4.5 | Very Low | £190,590 |
| CilycwmVery Low | 2.3 | 4.6 | Very Low | £294,998 |
| CenarthVery Low | 2.3 | 4.6 | Very Low | £284,300 |
| PendineVery Low | 2.3 | 5.5 | Very Low | — |
| Llanfair-ar-y-BrynVery Low | 2.3 | 4.6 | Very Low | £376,333 |
| TrelechVery Low | 2.3 | 4.7 | Very Low | £399,991 |
| LlanwinioVery Low | 2.4 | 4.7 | Very Low | £384,800 |
| LlansawelVery Low | 2.4 | 4.7 | Very Low | £212,000 |
| LlangelerVery Low | 2.4 | 4.7 | Very Low | £329,625 |
| CilymaenllwydVery Low | 2.4 | 4.7 | Very Low | £375,000 |
| Cynwyl ElfedVery Low | 2.4 | 4.7 | Very Low | £287,666 |
| TalleyVery Low | 2.5 | 4.8 | Very Low | £324,200 |
| EglwyscumminVery Low | 2.5 | 5.1 | Very Low | £286,500 |
| LlanfynyddVery Low | 2.5 | 4.9 | Very Low | £382,100 |
| LlanpumsaintVery Low | 2.5 | 4.8 | Very Low | £252,000 |
| LlanboidyVery Low | 2.6 | 4.8 | Very Low | £411,600 |
| LlanllawddogVery Low | 2.6 | 4.7 | Very Low | £352,857 |
| MyddfaiVery Low | 2.6 | 4.7 | Very Low | £482,500 |
| AbernantVery Low | 2.6 | 4.9 | Very Low | £229,000 |
| LlansadwrnVery Low | 2.7 | 4.8 | Very Low | £241,666 |
| Quarter BachVery Low | 2.8 | 4.7 | Very Low | £184,286 |
| LlanddowrorVery Low | 2.8 | 5.4 | Very Low | £171,500 |
| LlangadogVery Low | 2.8 | 4.8 | Very Low | £319,550 |
| TrimsaranVery Low | 2.8 | 5.4 | Very Low | £185,856 |
| HenllanfalltegVery Low | 2.9 | 4.9 | Very Low | £508,750 |
| St. IshmaelVery Low | 3.0 | 5.3 | Very Low | £254,025 |
| MeidrimVery Low | 3.0 | 5.0 | Very Low | £222,428 |
| LlanwrdaVery Low | 3.0 | 4.9 | Very Low | £399,166 |
| Laugharne TownshipVery Low | 3.0 | 5.4 | Very Low | £222,876 |
| LlangyndeyrnVery Low | 3.0 | 5.4 | Very Low | £214,487 |
| Newcastle EmlynVery Low | 3.0 | 4.7 | Very Low | £175,954 |
| LlansteffanVery Low | 3.0 | 5.3 | Very Low | £239,269 |
| LlangyninVery Low | 3.0 | 5.0 | Very Low | £329,500 |
| Pembrey and Burry Port TownVery Low | 3.0 | 5.6 | Very Low | £207,273 |
| CwmammanVery Low | 3.0 | 4.8 | Very Low | £181,774 |
| Manordeilo and SalemVery Low | 3.1 | 5.0 | Very Low | £378,750 |
| LlanegwadVery Low | 3.1 | 5.1 | Very Low | £329,083 |
| KidwellyVery Low | 3.1 | 5.4 | Very Low | £203,146 |
| BetwsVery Low | 3.1 | 5.0 | Very Low | £238,583 |
| Dyffryn CennenVery Low | 3.2 | 5.0 | Very Low | £249,521 |
| PontyberemVery Low | 3.2 | 5.4 | Very Low | £194,372 |
| WhitlandVery Low | 3.2 | 5.1 | Very Low | £214,613 |
| Llanfihangel AberbythychVery Low | 3.2 | 5.2 | Very Low | £255,412 |
| LlangathenVery Low | 3.2 | 5.1 | Very Low | £286,400 |
| BronwyddVery Low | 3.3 | 5.1 | Very Low | £153,000 |
| LlandoveryVery Low | 3.4 | 4.9 | Very Low | £218,357 |
| Newchurch and MerthyrVery Low | 3.4 | 5.1 | Very Low | £435,000 |
| LlanarthneyVery Low | 3.5 | 5.2 | Very Low | £426,000 |
| LlangynogVery Low | 3.5 | 5.3 | Very Low | £303,000 |
| AbergwiliVery Low | 3.6 | 5.1 | Very Low | £308,068 |
| LlandeiloVery Low | 3.6 | 5.1 | Very Low | £279,431 |
| LlangainVery Low | 3.6 | 5.3 | Very Low | £290,000 |
| LlandyfaelogVery Low | 3.7 | 5.3 | Very Low | £372,900 |
| LlandybieVery Low | 3.7 | 5.4 | Very Low | £233,383 |
| LlannonVery Low | 3.8 | 5.4 | Very Low | £210,228 |
| GorslasVery Low | 3.8 | 5.4 | Very Low | £273,319 |
| LlanddarogVery Low | 3.9 | 5.4 | Very Low | £266,277 |
| AmmanfordVery Low | 4.0 | 5.2 | Very Low | £203,897 |
| St. ClearsVery Low | 4.2 | 5.3 | Very Low | £248,933 |
| Llanelli RuralLow | 5.0 | 5.8 | Low | £200,512 |
| LlangennechLow | 5.0 | 5.8 | Low | £230,476 |
| LlanediLow | 5.2 | 5.6 | Low | £235,969 |
| CarmarthenLow | 5.2 | 5.5 | Low | £204,801 |
| LlangunnorLow | 5.3 | 5.5 | Low | £276,530 |
| LlanelliLow | 5.5 | 6.0 | Low | £170,046 |
Levels in µg/m³, 2025 annual average.
How does air quality in Sir Gaerfyrddin / Carmarthenshire compare with nearby areas?
Background NO₂ in Sir Gaerfyrddin / Carmarthenshire compared with the 6 nearest other areas in Cymru / Wales.
Sir Gaerfyrddin / Carmarthenshire vs West Glamorgan
- Sir Gaerfyrddin / Carmarthenshire
- NO₂ 4.0 µg/m³
- West Glamorgan
- NO₂ 6.1 µg/m³
Open comparison
Sir Gaerfyrddin / Carmarthenshire vs Ceredigion
- Sir Gaerfyrddin / Carmarthenshire
- NO₂ 4.0 µg/m³
- Ceredigion
- NO₂ 2.5 µg/m³
Open comparison
Sir Gaerfyrddin / Carmarthenshire vs Mid Glamorgan
- Sir Gaerfyrddin / Carmarthenshire
- NO₂ 4.0 µg/m³
- Mid Glamorgan
- NO₂ 6.2 µg/m³
Open comparison
Sir Gaerfyrddin / Carmarthenshire vs Pembrokeshire
- Sir Gaerfyrddin / Carmarthenshire
- NO₂ 4.0 µg/m³
- Pembrokeshire
- NO₂ 3.5 µg/m³
Open comparison
Sir Gaerfyrddin / Carmarthenshire vs Blaenau Gwent
- Sir Gaerfyrddin / Carmarthenshire
- NO₂ 4.0 µg/m³
- Blaenau Gwent
- NO₂ 4.9 µg/m³
Open comparison
Sir Gaerfyrddin / Carmarthenshire vs Powys
- Sir Gaerfyrddin / Carmarthenshire
- NO₂ 4.0 µg/m³
- Powys
- NO₂ 3.5 µg/m³
Open comparison
Does this include busy roads?
No. These are background levels: yearly averages over 1 km squares, away from the immediate influence of roads. Right beside a busy road in Sir Gaerfyrddin / Carmarthenshire, NO₂ can be much higher. Councils publish roadside monitoring in their annual air quality reports.
What else do people ask about Sir Gaerfyrddin / Carmarthenshire?
More quick answers on house prices, sales, areas, green space, crime, air quality and listed buildings in Sir Gaerfyrddin / Carmarthenshire.
- What is the average house price in Sir Gaerfyrddin / Carmarthenshire?
- When did average house prices in Sir Gaerfyrddin / Carmarthenshire reach their peak?
- How many properties are being sold in Sir Gaerfyrddin / Carmarthenshire?
- What type of properties are sold in Sir Gaerfyrddin / Carmarthenshire?
- What price range do most homes sell for in Sir Gaerfyrddin / Carmarthenshire?
- What is the most expensive (and cheapest) area of Sir Gaerfyrddin / Carmarthenshire?
- How many parks and green spaces are in Sir Gaerfyrddin / Carmarthenshire?
- What is the crime rate in Sir Gaerfyrddin / Carmarthenshire?
- How many listed buildings are in Sir Gaerfyrddin / Carmarthenshire?
- How do Sir Gaerfyrddin / Carmarthenshire house prices compare with another area?
Where does this data come from?
Price information is from HM Land Registry, location boundaries are from OpenStreetMap, and households and population are from Nomis Census 2021 postcode estimates (21 March 2021). Parks and green space are from OS Open Greenspace. Contains OS data © Crown copyright and database right 2026. Crime is from police.uk street-level data. Contains public sector information licensed under the Open Government Licence v3.0. Source: police.uk. Listed buildings and scheduled monuments are from Historic England and Cadw, and conservation areas from planning.data.gov.uk. Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), licensed under the Open Government Licence. Air quality is from Defra modelled background pollution maps. Contains public sector information licensed under the Open Government Licence v3.0. Source: Defra modelled background pollution, 2025.
Last updated 11 November 2026 at 00:16 with the latest Land Registry data (September 2026). The Sir Gaerfyrddin / Carmarthenshire dataset covers 7,990 postcodes.
Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
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