Suburban Area CLIMATE RISK
Holborn sits inside the City of London council area, made up of residential streets and local-centre parades rather than its own town centre. LocalRisk has flood, heat, air and ground-stability data for 21 postcodes in Holborn; 12 samples are linked at the foot of this page.
Holborn inherits its flood band (Lower) from the wider City of London council area because the Environment Agency does not publish settlement-level breakdowns for every UK location. Search any postcode in Holborn below for the address-level reading from Environment Agency NaFRA2.
Met Office UKCP18 projections estimate around 41 days above 25°C per year across the City of London area for the 2021-2040 period - the central scenario under high emissions; lower-emissions paths give lower numbers. Heat exposure within Holborn itself is uneven: top-floor flats, west-facing terraces and properties without through-ventilation hold heat well into the night, while ground-floor homes near tree cover or open ground cool faster. The headline 41-day figure is an area average, not a property-level reading.
Annual mean PM2.5 across the City of London area is 11.0 µg/m³ - above the World Health Organisation guideline of 5 µg/m³ and within the UK Environment Act 2021 target of 10 µg/m³ by 2040. Within Holborn, readings are not flat: postcodes within 200 metres of an A-road or major junction routinely run 30-50% higher during weekday rush hours than residential streets two roads back. Defra's UK-AIR network supplies the underlying figure.
Ground stability in Holborn follows the underlying geology more than the postal boundary. The British Geological Survey GeoSure dataset maps clay shrink-swell risk on a 50-metre cell, and properties on the same street can sit in different bands where a clay seam ends mid-road. Pre-1980 housing on clay-rich ground is the most exposed; properties on bedrock or well-drained sandy soils are typically lower-risk. A postcode-level check picks up that variation.
A free postcode check on LocalRisk covers up to six hazards for any address in Holborn: Environment Agency flood mapping, BGS ground stability, Met Office heat projections, Defra PM2.5, plus coastal erosion and green-space access where relevant. The postcode list below opens an address-level report for each postcode in Holborn; the council link at the top of this page returns to the wider City of London picture.
Council area level (City of London). Search a postcode for detail.