Check air quality by postcode. Air pollution is the largest environmental risk to public health in the UK. LocalRisk uses Defra UK-AIR PM2.5 data to show particulate pollution levels for 1.8 million UK postcodes - alongside flood, heat and subsidence risk.
PM2.5 is fine particulate matter under 2.5 micrometres - roughly 30 times thinner than a human hair. These particles pass through the lungs into the bloodstream. Long-term exposure is associated with cardiovascular disease, respiratory conditions and reduced life expectancy. UKHSA modelling, drawing on the Committee on the Medical Effects of Air Pollutants (COMEAP), estimates around 30,000 UK deaths per year are linked to fine particulate exposure.
The WHO recommends an annual average no greater than 5 µg/m³ (2021 guideline). The UK's current legally binding annual limit is 25 µg/m³ (retained from EU law). England's Environment Act 2021 sets a statutory target of 10 µg/m³ by 2040 - still double the WHO guideline but a significant step down. Most UK urban areas sit between 8 and 15 µg/m³.
Air quality is poorest in urban centres with heavy traffic, industrial activity or limited airflow between buildings. Greater London, parts of the Midlands, south Wales and Glasgow typically record the highest nitrogen dioxide levels. For PM2.5, several cities across England and Northern Ireland regularly exceed the WHO guideline. Rural and coastal areas generally fare better, though some UK particulate matter originates from continental Europe.
Evidence suggests it can. Hedonic pricing studies of UK property markets indicate poor air quality is associated with property value discounts of a few percent compared with similar homes in cleaner areas, with the size varying by location and study methodology. Buyer awareness of pollution limits has grown alongside the introduction of Clean Air Zones in major cities.
Clean Air Zones charge vehicles that don't meet emission standards to enter designated city-centre areas. In England, zones operate in Bath, Birmingham, Bradford, Bristol, Portsmouth, Sheffield and Tyneside. London runs its own Ultra Low Emission Zone covering almost all of Greater London. Scotland operates Low Emission Zones in Glasgow, Edinburgh, Dundee and Aberdeen. Wales does not currently have charging zones.
PM2.5 and nitrogen dioxide concentrations are typically highest in winter. Cold, still air traps emissions near ground level, and domestic heating adds to the load. Ground-level ozone is more of a summer concern - it forms when sunlight reacts with vehicle and industrial emissions. Heatwaves can make things worse by creating stagnant air conditions that concentrate pollutants.
LocalRisk uses Defra UK-AIR modelled background PM2.5 concentrations, which estimate annual average pollution levels on a 1km grid across the UK. These are mapped to council areas and then to postcodes. The result shows how your area compares to the national picture. For live conditions, Defra's daily air-quality forecast service is the official source.