BB2 1AH - Flood, Heat, Air & Subsidence Risk - Bank Top (BB2)

Blackburn with Darwen, Bank Top (BB2)

Climate risk summary for BB2 1AH

Heat risk is Lower, with a median (50th percentile) of 11 days above 25°C per year, averaged over the 2021-2040 period under the RCP8.5 high emissions scenario (Met Office UKCP18). Air quality is Medium at PM2.5 6.3 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Glacial Till geology; shrink-swell risk is classed as improbable (BGS GeoClimate).

• Flood: No flood-risk band is published for this postcode in the current dataset releases - a data-coverage gap rather than a rating. The national agencies' address-level flood services cover every property.
• Heat: Projected 11 days above 25°C per year, 2021-2040 average (Met Office UKCP18, 50th percentile under RCP8.5, 12 km grid - postcodes within the same grid cell share this value).
• Air quality: PM2.5 6.3 µg/m³ - above the WHO annual guideline of 5 µg/m³ (Defra UK-AIR PCM model, council-level average - every postcode in this council shows this value).
• Ground: BGS data: Glacial Till geology. Shrink-swell risk classed as improbable (British Geological Survey).
• Green space: 89% of households here have accessible green space within a 15-minute walk (the government's Environmental Improvement Plan standard), and less than 1% have a park or green space within a 200m walk of their door - below the England median (Defra, 2025).

What is the flood risk in BB2 1AH?

An official flood-risk band is not available for BB2 1AH in the current dataset releases used by LocalRisk. This is a data-coverage gap rather than a low-risk rating. For a property-level reading, the Environment Agency's Check Your Long-Term Flood Risk service covers every address in England.

How is the air quality in BB2 1AH?

Air quality at BB2 1AH is rated Medium, based on Defra UK-AIR annual mean PM2.5 data. Fine particulate matter (PM2.5) comes primarily from road traffic, industry, and domestic burning. Long-term exposure above the WHO guideline of 5 µg/m³ is linked to respiratory and cardiovascular health risks. Buyers and renters in higher air quality risk areas may wish to consider whether the property is near busy roads or industrial sources.

Is subsidence a risk at BB2 1AH?

British Geological Survey data classes the underlying soil at BB2 1AH as Glacial Till, with shrink-swell hazard rated improbable (subsidence risk band: Low). A structural survey is the reliable way to assess ground conditions for a specific property.

Where does this data come from?

This LocalRisk report for BB2 1AH draws on four official UK open data sources: Environment Agency NaFRA2 flood modelling, Met Office UKCP18 climate projections, Defra UK-AIR PM2.5 monitoring, and British Geological Survey GeoClimate subsidence mapping. Risk ratings are a screening tool, complementing - not replacing - the searches and surveys ordered as part of a property transaction. Data covers Blackburn with Darwen and is updated as new official datasets are published.

About the Blackburn with Darwen area

Blackburn with Darwen has an inland setting of valleys and rising ground and experiences cool, wet winters and warm summers, shaped by upland surroundings and urban development.

Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for BB2 1AA is at localrisk.co.uk/postcode/BB21AA, and you can compare BB2 1AH side by side with any UK postcode at localrisk.co.uk/compare.