What's the air quality in Ynys Môn / Isle of Anglesey? NO₂ 3.3 µg/m³
In 2025 the average resident of Ynys Môn / Isle of Anglesey lived with background NO₂ of 3.3 µg/m³, Very Low for England and Wales and below the WHO guideline of 10. PM2.5 was 5.2 µg/m³, Very Low for England and Wales and about 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
- 5.2 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 Ynys Môn / Isle of AngleseyIs the air quality good in Ynys Môn / Isle of Anglesey?
Background NO₂ in Ynys Môn / Isle of Anglesey is 3.3 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 Ynys Môn / Isle of Anglesey is 5.2 µg/m³, about 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): 3.3 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): 5.2 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 Ynys Môn / Isle of Anglesey has the cleanest air?
Llanddona has the lowest background NO₂ of the 40 areas of Ynys Môn / Isle of Anglesey, at 2.2 µg/m³. Holyhead has the highest, at 5.0 µg/m³. Average house prices are shown alongside, so you can weigh air quality against cost.
| Area | NO₂ | PM2.5 | NO₂ band | Average price |
|---|---|---|---|---|
| LlanddonaVery Low | 2.2 | 4.7 | Very Low | £284,316 |
| AberffrawVery Low | 2.3 | 5.1 | Very Low | £181,250 |
| LlangoedVery Low | 2.4 | 4.9 | Very Low | £303,500 |
| Llannerch-y-MeddVery Low | 2.4 | 5.0 | Very Low | £182,963 |
| LlaneilianVery Low | 2.4 | 5.1 | Very Low | £332,156 |
| RhosybolVery Low | 2.4 | 5.0 | Very Low | £343,714 |
| MechellVery Low | 2.4 | 5.0 | Very Low | £283,564 |
| Tref AlawVery Low | 2.5 | 5.0 | Very Low | £273,714 |
| LlanfaelogVery Low | 2.5 | 5.3 | Very Low | £370,425 |
| AmlwchVery Low | 2.5 | 5.1 | Very Low | £197,209 |
| MoelfreVery Low | 2.5 | 5.2 | Very Low | £364,962 |
| BodorganVery Low | 2.5 | 5.0 | Very Low | £220,625 |
| LlaneugradVery Low | 2.6 | 5.1 | Very Low | £424,500 |
| BodedernVery Low | 2.6 | 5.1 | Very Low | £239,000 |
| RhosyrVery Low | 2.6 | 5.1 | Very Low | £296,216 |
| BodfforddVery Low | 2.6 | 5.1 | Very Low | £283,710 |
| RhoscolynVery Low | 2.6 | 5.2 | Very Low | £696,333 |
| LlanbadrigVery Low | 2.6 | 5.0 | Very Low | £256,638 |
| Cylch-y-GarnVery Low | 2.6 | 5.0 | Very Low | £278,666 |
| LlanddyfnanVery Low | 2.7 | 5.1 | Very Low | £364,625 |
| Llanfair-Mathafarn-EithafVery Low | 2.8 | 5.2 | Very Low | £311,121 |
| Llanfair-yn-NeubwllVery Low | 2.8 | 5.3 | Very Low | £203,136 |
| BeaumarisVery Low | 2.8 | 5.0 | Very Low | £474,291 |
| LlanidanVery Low | 2.9 | 5.1 | Very Low | £209,875 |
| PentraethVery Low | 2.9 | 5.0 | Very Low | £209,272 |
| TrewalchmaiVery Low | 2.9 | 5.1 | Very Low | £210,416 |
| LlanfachraethVery Low | 3.0 | 5.2 | Very Low | £343,750 |
| TrearddurVery Low | 3.0 | 5.1 | Very Low | £372,531 |
| BryngwranVery Low | 3.1 | 5.2 | Very Low | £229,386 |
| LlanfaethluVery Low | 3.1 | 5.1 | Very Low | £440,000 |
| ValleyVery Low | 3.1 | 5.2 | Very Low | £263,727 |
| LlangristiolusVery Low | 3.2 | 5.2 | Very Low | £211,375 |
| Llanddaniel FabVery Low | 3.2 | 5.2 | Very Low | £342,458 |
| LlangefniVery Low | 3.2 | 5.3 | Very Low | £225,739 |
| Cwm CadnantVery Low | 3.3 | 5.1 | Very Low | £297,633 |
| PenmynyddVery Low | 3.4 | 5.1 | Very Low | £271,250 |
| Llanfihangel YsgeifiogVery Low | 3.4 | 5.2 | Very Low | £209,522 |
| Menai BridgeVery Low | 4.4 | 5.3 | Very Low | £266,696 |
| Llanfair PwllgwyngyllVery Low | 4.7 | 5.4 | Very Low | £262,016 |
| HolyheadLow | 5.0 | 5.1 | Low | £158,141 |
Levels in µg/m³, 2025 annual average.
How does air quality in Ynys Môn / Isle of Anglesey compare with nearby areas?
Background NO₂ in Ynys Môn / Isle of Anglesey compared with the 6 nearest other areas in Cymru / Wales.
Ynys Môn / Isle of Anglesey vs Conwy
- Ynys Môn / Isle of Anglesey
- NO₂ 3.3 µg/m³
- Conwy
- NO₂ 4.0 µg/m³
Open comparison
Ynys Môn / Isle of Anglesey vs Gwynedd
- Ynys Môn / Isle of Anglesey
- NO₂ 3.3 µg/m³
- Gwynedd
- NO₂ 2.3 µg/m³
Open comparison
Ynys Môn / Isle of Anglesey vs Denbighshire
- Ynys Môn / Isle of Anglesey
- NO₂ 3.3 µg/m³
- Denbighshire
- NO₂ 4.8 µg/m³
Open comparison
Ynys Môn / Isle of Anglesey vs Flintshire
- Ynys Môn / Isle of Anglesey
- NO₂ 3.3 µg/m³
- Flintshire
- NO₂ 7.9 µg/m³
Open comparison
Ynys Môn / Isle of Anglesey vs Wrexham
- Ynys Môn / Isle of Anglesey
- NO₂ 3.3 µg/m³
- Wrexham
- NO₂ 7.7 µg/m³
Open comparison
Ynys Môn / Isle of Anglesey vs Ceredigion
- Ynys Môn / Isle of Anglesey
- NO₂ 3.3 µg/m³
- Ceredigion
- NO₂ 2.5 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 Ynys Môn / Isle of Anglesey, NO₂ can be much higher. Councils publish roadside monitoring in their annual air quality reports.
What else do people ask about Ynys Môn / Isle of Anglesey?
More quick answers on house prices, sales, areas, green space, crime, air quality and listed buildings in Ynys Môn / Isle of Anglesey.
- What is the average house price in Ynys Môn / Isle of Anglesey?
- When did average house prices in Ynys Môn / Isle of Anglesey reach their peak?
- How many properties are being sold in Ynys Môn / Isle of Anglesey?
- What type of properties are sold in Ynys Môn / Isle of Anglesey?
- What price range do most homes sell for in Ynys Môn / Isle of Anglesey?
- What is the most expensive (and cheapest) area of Ynys Môn / Isle of Anglesey?
- How many parks and green spaces are in Ynys Môn / Isle of Anglesey?
- What is the crime rate in Ynys Môn / Isle of Anglesey?
- How many listed buildings are in Ynys Môn / Isle of Anglesey?
- How do Ynys Môn / Isle of Anglesey 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 00:17 with the latest Land Registry data (September 2026). The Ynys Môn / Isle of Anglesey dataset covers 3,244 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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