OL3 5AA - Flood, Heat, Air & Subsidence Risk - Dobcross (OL3)

Oldham, Dobcross (OL3)

Climate risk summary for OL3 5AA

OL3 5AA in Dobcross (OL3) has a Low flood risk - EA NaFRA2 data records 6 properties in a flood risk zone. 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 7.5 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Sandstone geology; shrink-swell risk is classed as improbable (BGS GeoClimate).

• Flood: EA NaFRA2: 6 low flood risk properties in this postcode.
• 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 7.5 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: Sandstone geology. Shrink-swell risk classed as improbable (British Geological Survey).
• Green space: 100% of households here have accessible green space within a 15-minute walk (the government's Environmental Improvement Plan standard), and 14% have a park or green space within a 200m walk of their door - near the England median (Defra, 2025).

What is the flood risk in OL3 5AA?

Flood risk at OL3 5AA is rated Low, based on Environment Agency NaFRA2 modelling.

Environment Agency flood zone data shows low flood risk for OL3 5AA in Dobcross (OL3). EA NaFRA2 data shows 6 at low risk in this postcode. The band reflects the highest flood risk within the postcode; some properties within this postcode may face little or no direct flood risk. For a specific property, a conveyancing search will confirm the exact flood zone position.

How is the air quality in OL3 5AA?

Air quality at OL3 5AA 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 OL3 5AA?

British Geological Survey data classes the underlying soil at OL3 5AA as Sandstone, 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 OL3 5AA 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 Oldham and is updated as new official datasets are published.

About the Oldham area

Oldham has an upland town setting with steep valleys, former industrial land and surrounding moorland and experiences cool, wet winters and mild summers, influenced by elevation and Pennine weather patterns.

What should buyers and renters check in OL3 5AA?

Practical check: EA data flags 6 properties at flood risk here - check whether the property is among them by comparing its position to the flood zone boundary. With PM2.5 above WHO guidelines here, check which bedrooms face busy roads and how fresh air is drawn into living spaces. These are postcode-level indicators - conditions vary between individual properties.