How to check noise and air quality near a home

Official noise maps estimate the noise from major roads and railways, the busiest airports publish their own, and Defra’s UK-AIR site holds air pollution data and forecasts. Use them to spot likely problems, then visit at the times that matter to you.

Checked 16 Oct 2026

Noise: what the official maps show

Defra’s strategic noise maps estimate noise from major roads and railways across England, and in large urban areas; the latest round reflects traffic in 2021. The Welsh Government publishes equivalent maps for Wales on DataMapWales. The maps calculate noise at a point 4 metres above the ground, not inside a room.

They give two main figures in decibels (dB): a level averaged over the whole day, with evening and night noise weighted more heavily because it is more disturbing then, and a level for the night alone. For comparison, the World Health Organization recommends keeping road traffic noise below 53 dB across the day and 45 dB at night, with slightly different figures for rail and lower ones for aircraft. Every rise of about 10 dB sounds roughly twice as loud.

What the maps leave out

smaller roads outside the mapped urban areas;
neighbours, pubs, schools, building sites, extractor fans and other local sources;
anything new since the maps were made, such as a new road or a busier rail line;
the layout of the home: a bedroom at the back can be much quieter than the figure for the front.

Aircraft noise

The busiest airports publish their own noise maps and flight path information, and some run sound insulation schemes for nearby homes. Check the airport’s website and its consultations, since flight paths can change. GOV.UK explains how to deal with noise from roads, trains or planes.

Air quality: the pollutants that matter

Nitrogen dioxide (NO2) comes mostly from road traffic, especially diesel vehicles. It is highest beside busy roads and junctions and falls quickly with distance from them.
Fine particulates (PM2.5) come from traffic, wood burning, industry and farming, and some blow in from further afield. They are spread more evenly than nitrogen dioxide.
Coarser particles (PM10) add dust from building work, brake and tyre wear and natural sources to the same mix.

Each pollutant is judged against UK legal limits and against the World Health Organization’s guidelines, which are stricter. Many places meet the legal limits but not the guidelines.

Outdoor figures are only part of the picture: gas hobs, wood burners and candles raise pollution inside a home, and good ventilation brings it down.

Where to look up air quality

UK-AIR, Defra’s air quality site, has measurements from monitoring stations, maps of background pollution and the daily forecast.
The Daily Air Quality Index rates pollution from 1 (low) to 10 (very high). It shows short episodes, not the long-term average where you live.
Councils declare air quality management areas where pollution breaks national objectives, usually along busy roads. UK-AIR keeps a list of them, and council air quality reports often include local monitoring results.
In Wales, Air Quality in Wales publishes Welsh monitoring data and forecasts.

Background maps show an average for an area, usually a 1 km square, away from roads. A home that fronts a busy road can have noticeably higher levels than the figure for its square.

Visit at different times

Maps narrow things down; your own ears and nose are the real test.

Visit on a weekday at rush hour, in the evening and at the weekend, when pubs, sports grounds or a busy road can sound very different.
Stand in the garden and the bedrooms with the windows open, and listen for trains, aircraft, sirens and neighbours.
Look for nearby sources the maps miss, such as a takeaway extractor, a bus stop, a school, a depot or a building site.
Ask the seller about any noise complaints or disputes with neighbours. The property information form the seller completes asks about disputes and complaints.
Search the council’s planning register for new roads, large developments or late-night venues planned nearby.

In a flat, noise from neighbours often matters more than the road. Ask about the flats above and below, and whether hard floors have been laid; many leases restrict them, so see what to check before buying a leasehold home.

If the home is near a river or on low ground, check its flood risk at the same time.

Check it for a specific home

Where the home can be placed on the noise maps, the Noise section of a HouseReport report gives road and rail noise at its point, by day and at night, against the World Health Organization’s guidelines; Air quality gives background levels of nitrogen dioxide and particulates around the home, compared with homes across England and Wales. The report does not cover aircraft noise, so check the airport’s maps if you are near a flight path, and look up any address to see its free preview.

Look up any address

The free preview shows which of these checks the report answers for that home.