Data catalogue/ Environmental risk/ Noise & air quality

Noise & air quality

Road noise, rail noise, and today's air quality index by UPRN. DEFRA Lden noise data in decibels with plain-English severity labels, from Very Low to Extreme. Air quality via the UK-AIR DAQI daily forecast from the nearest monitoring station.

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Sample responseJSON

{
  "risk_type": "noise",
  "uprn": 10002341182,
  "results": [
    {
      "risk_type": "road_noise",
      "label": "Medium-High",
      "score": 63.4,
      "score_unit": "dB",
      "intersects": true,
      "distance_m": 0,
      "search_radius_m": 0,
      "radius_description": "At property",
      "properties": {
        "description": "Traffic intrusive indoors (63dB)"
      }
    },
    {
      "risk_type": "rail_noise",
      "label": "High",
      "score": 68.1,
      "score_unit": "dB",
      "intersects": true,
      "distance_m": 0,
      "search_radius_m": 0,
      "radius_description": "At property",
      "properties": {
        "description": "Significant rail noise (68dB)"
      }
    }
  ]
}

Noise profile at a glance

Road and rail noise are returned as separate results, each with a dB score and a severity label. If neither applies to the property, the results array is empty.

UPRN 10002341182: Noise Profile

London SE1: near railway viaduct

risks/noise

Road Noise Medium-High

Lden score

63.4 dB

Source

road_noise

Method

At property

Rail Noise High

Lden score

68.1 dB

Source

rail_noise

Method

At property

Severity bands (applies to both road and rail)

<40 dB Very low

40–50 dB Low

50–55 dB Low-Medium

55–60 dB Medium

60–65 dB Medium-High

65–70 dB High

70–75 dB Very High

75+ dB Extreme

Response fields

Noise returns 0–2 results (one per source). Air quality ( /risks/air_quality_today/ ) returns a separate DAQI score from the nearest monitoring station.

Use /risks/air_quality_today/ for live DAQI score (1–10) from the nearest UK-AIR monitoring station. Low (1–3), Moderate (4–6), High (7–9), Very High (10).

Field	Type	What it is
risk_type	string	"road_noise" or "rail_noise"
label	string	Very low / Low / Low-Medium / Medium / Medium-High / High / Very High / Extreme
score	float	Lden decibel value at property location
score_unit	string	Always "dB"
intersects	boolean	True if noise data exists at property
distance_m	integer	0: point query at property
search_radius_m	integer	0, no radius, exact location
radius_description	string	"At property"
properties.description	string	Human-readable label + dB value

Air quality endpoint

GET /risks/air_quality_today/?uprn=

Built for

Property search platforms

Surface noise exposure alongside price and EPC. Properties above 65dB are subject to WHO adverse health effect thresholds: buyers increasingly ask.

Mortgage risk & insurance

Noise is a material factor in residential valuations. Flag properties in Very High or Extreme bands for closer scrutiny, particularly near major roads or HS2 corridors.

Developer site assessment

Planning applications in noise-sensitive areas need noise impact assessments. Pre-screen sites against DEFRA Lden thresholds before commissioning acoustic surveys.

The API

API example

GET /risks/noise/?uprn= cURL
Response 200 OK

Read the docs →

curl "https://api.homedata.co.uk/risks/noise/?uprn=10002341182" \
  -H "Authorization: Api-Key YOUR_KEY"

Full endpoint reference → · ← Back to Environmental Risk

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