What's the air quality in Flintshire? NO₂ 7.9 µg/m³
In 2025 the average resident of Flintshire lived with background NO₂ of 7.9 µg/m³, High for England and Wales and below the WHO guideline of 10. PM2.5 was 6.3 µg/m³, Low for England and Wales and 1.3 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
- 6.3 µg/m³
- NO₂ for England and Wales
- High
- 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 FlintshireIs the air quality good in Flintshire?
Background NO₂ in Flintshire is 7.9 µg/m³, below the WHO guideline of 10, and higher than the typical area (7.2). That puts it in the High band. Background PM2.5 in Flintshire is 6.3 µg/m³, 1.3 times the WHO guideline of 5, and lower than the typical area (7.4). That puts it in the 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): 7.9 µg/m³
NO₂ level is High, on a scale from Very Low to Very High.
High means the second-highest 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): 6.3 µg/m³
PM2.5 level is Low, on a scale from Very Low to Very High.
Low means the second-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 Flintshire has the cleanest air?
Nannerch has the lowest background NO₂ of the 34 areas of Flintshire, at 3.8 µg/m³. Sealand has the highest, at 11.8 µg/m³. Average house prices are shown alongside, so you can weigh air quality against cost.
| Area | NO₂ | PM2.5 | NO₂ band | Average price |
|---|---|---|---|---|
| NannerchVery Low | 3.8 | 4.9 | Very Low | £394,000 |
| CaerwysVery Low | 3.8 | 5.0 | Very Low | £249,811 |
| Gwernaffield and PantymwynVery Low | 4.0 | 5.2 | Very Low | £408,521 |
| YsceifiogVery Low | 4.1 | 5.1 | Very Low | £464,250 |
| CilcainVery Low | 4.1 | 5.2 | Very Low | £344,750 |
| TreuddynVery Low | 4.1 | 5.2 | Very Low | £261,681 |
| NercwysVery Low | 4.2 | 5.2 | Very Low | £414,400 |
| Trelawnyd and GwaenysgorVery Low | 4.3 | 5.1 | Very Low | £260,813 |
| GwernymynyddVery Low | 4.3 | 5.2 | Very Low | £274,609 |
| LlanasaLow | 4.8 | 5.3 | Low | £233,744 |
| WhitfordLow | 5.1 | 5.3 | Low | £276,711 |
| LlanfynyddLow | 5.1 | 5.6 | Low | £292,190 |
| HalkynLow | 5.2 | 5.5 | Low | £289,316 |
| BrynfordLow | 5.3 | 5.4 | Low | £378,250 |
| Leeswood and PontblyddynLow | 5.4 | 5.6 | Low | £210,125 |
| MostynLow | 5.7 | 5.5 | Low | £185,850 |
| HolywellLow | 6.1 | 5.7 | Low | £184,243 |
| MoldLow | 6.1 | 5.7 | Low | £237,214 |
| HopeLow | 6.4 | 6.1 | Low | £244,049 |
| BagilltTypical | 7.1 | 6.0 | Typical | £203,871 |
| ArgoedTypical | 7.4 | 6.2 | Typical | £245,077 |
| NorthopTypical | 7.5 | 6.0 | Typical | £305,769 |
| Higher KinnertonHigh | 7.8 | 6.6 | High | £368,977 |
| FlintHigh | 8.0 | 6.2 | High | £193,994 |
| BuckleyHigh | 8.1 | 6.4 | High | £228,047 |
| PenyfforddHigh | 8.3 | 6.4 | High | £298,760 |
| Connah's QuayHigh | 8.9 | 6.8 | High | £208,474 |
| Northop HallVery High | 9.4 | 6.6 | Very High | £238,954 |
| SaltneyVery High | 10.5 | 7.4 | Very High | £191,207 |
| ShottonVery High | 10.6 | 7.1 | Very High | £171,171 |
| HawardenVery High | 10.6 | 7.0 | Very High | £285,301 |
| QueensferryVery High | 11.3 | 7.3 | Very High | £150,080 |
| Broughton and BrettonVery High | 11.3 | 7.2 | Very High | £237,711 |
| SealandVery High | 11.8 | 7.3 | Very High | £245,673 |
Levels in µg/m³, 2025 annual average.
How does air quality in Flintshire compare with nearby areas?
Background NO₂ in Flintshire compared with the 6 nearest other areas in Cymru / Wales.
Flintshire vs Denbighshire
- Flintshire
- NO₂ 7.9 µg/m³
- Denbighshire
- NO₂ 4.8 µg/m³
Open comparison
Flintshire vs Wrexham
- Flintshire
- NO₂ 7.9 µg/m³
- Wrexham
- NO₂ 7.7 µg/m³
Open comparison
Flintshire vs Conwy
- Flintshire
- NO₂ 7.9 µg/m³
- Conwy
- NO₂ 4.0 µg/m³
Open comparison
Flintshire vs Gwynedd
- Flintshire
- NO₂ 7.9 µg/m³
- Gwynedd
- NO₂ 2.3 µg/m³
Open comparison
Flintshire vs Ynys Môn / Isle of Anglesey
- Flintshire
- NO₂ 7.9 µg/m³
- Ynys Môn / Isle of Anglesey
- NO₂ 3.3 µg/m³
Open comparison
Flintshire vs Powys
- Flintshire
- NO₂ 7.9 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 Flintshire, NO₂ can be much higher. Councils publish roadside monitoring in their annual air quality reports.
What else do people ask about Flintshire?
More quick answers on house prices, sales, areas, green space, crime, air quality and listed buildings in Flintshire.
- What is the average house price in Flintshire?
- When did average house prices in Flintshire reach their peak?
- How many properties are being sold in Flintshire?
- What type of properties are sold in Flintshire?
- What price range do most homes sell for in Flintshire?
- What is the most expensive (and cheapest) area of Flintshire?
- How many parks and green spaces are in Flintshire?
- What is the crime rate in Flintshire?
- How many listed buildings are in Flintshire?
- How do Flintshire 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 00:18 with the latest Land Registry data (September 2026). The Flintshire dataset covers 5,437 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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