Air Quality Check
Check today's air quality at any UK property using the DAQI index. Important for families, asthma sufferers, and health-conscious buyers.
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Air Quality FAQ
What is the DAQI index?
The Daily Air Quality Index (DAQI) is the UK government's standard air pollution scale, running from 1 (Low) to 10 (Very High). It combines readings for particulate matter (PM2.5, PM10), nitrogen dioxide (NO₂), ozone (O₃), and sulphur dioxide (SO₂). It is published daily by the UK Health Security Agency.[2]
Where is air quality worst in the UK?
Air quality tends to be poorest in central London, Birmingham, Manchester, and other major urban centres — particularly near busy roads and industrial areas. Rural areas generally have better air quality, though agricultural emissions can affect some rural locations.
Does air quality affect property value?
Research from LSE found that a 10% reduction in air pollution is associated with a 1.5% increase in house prices. Areas with Clean Air Zones (CAZ) are seeing gradual improvement. Air quality is increasingly a factor for health-conscious buyers, particularly families with young children or people with respiratory conditions.
Is this today's live air quality?
Yes — air quality data is updated daily and reflects current DAQI readings for the property's location. For a long-term picture, check the DEFRA Air Quality Statistics, which publish historical annual mean pollution data by area.[1]
Sources
Further reading
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Free to startToday's DAQI score (1–10) with recorded concentrations of NO₂, PM2.5, PM10, and O₃ measured against WHO air quality guideline limits — the precise scientific readings, not just a colour band.
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What does an air quality check show?
The air quality checker returns today's DAQI (Daily Air Quality Index) score for any UK property, alongside measured concentrations of key pollutants from the nearest DEFRA AURN (Automatic Urban and Rural Network) monitoring station. The AURN is the primary UK air quality monitoring network, with over 1,500 automatic monitoring stations across England, Wales, Scotland, and Northern Ireland.
Key pollutants explained
- NO₂ (nitrogen dioxide) — mainly from road traffic, particularly diesel engines. WHO guideline: 10 µg/m³ annual mean. High NO₂ is common on busy roads and near junctions.
- PM2.5 (fine particles) — particles under 2.5 micrometres, which penetrate deepest into the lungs. Sources include vehicle exhaust, wood burning, and secondary formation. WHO guideline: 5 µg/m³ annual mean.
- PM10 (coarse particles) — particles under 10 micrometres. Sources include road dust, construction, and industry.
- O₃ (ozone) — forms in sunlight from other pollutants. Higher in summer and in rural areas downwind of urban centres.
Why air quality matters before buying
Long-term exposure to elevated air pollution is linked to respiratory and cardiovascular disease. Research from LSE found that a 10% reduction in local air pollution is associated with a 1.5% increase in house prices — suggesting the market does price in air quality to some extent. For families with young children, people with asthma, or buyers relocating from a less polluted area, running an air quality check before committing to a purchase is a straightforward step that takes seconds.
Data source: DEFRA Automatic Urban and Rural Network (AURN), published under the Open Government Licence. Last reviewed: May 2026.