St Clements Hill Newham, Cornwall
8 addresses across 1 postcode (TR1), about 170 m long. USRN 6102348.
- Sales: 11 recorded sales since 1995; in 2024 the median was £1,540,000 across 1 sale.
- Prices and rents: A typical home in Cornwall cost £274,570 in August 2026 (-2.9% on a year); private rents averaged £995 a month.
- Energy: 5 homes have an energy certificate (A: 1, D: 3, E: 1).
- Flood: No address on its postcodes is in an area at high or medium risk of flooding from rivers, the sea or surface water.
- Recorded floods: No recorded flood covers the centre of any of its postcodes.
- Storm overflows: 6 storm overflows within 1 km (0.6 miles) spilled 77 times (61 hours) in 2025.
- Coastal erosion: The nearest projected coastal erosion zone is 700 m (0.4 miles) from its postcodes.
- Radon: Up to 30% or more of homes in the 1 km squares around it are estimated to be at or above the radon Action Level.
- Council tax: Most homes around it are in council tax band B; Band D in Cornwall costs £2,591 a year in 2026-27.
- Broadband: Gigabit broadband is available to 86% of premises.
- Transport: The nearest railway station is Truro, about 2.1 km (1.3 miles) away in a straight line.
- Green space: The nearest park or garden, Furniss Island, is about 780 m (0.5 miles) away.
- Air: Background air pollution in 2024 was 4.2 µg/m³ of nitrogen dioxide and 5.3 of PM2.5, within UK legal limits.
- Height: Its addresses are 55 to 62 m above sea level.
- Noise: None of its addresses is modelled at 55 dB or more from road traffic.
- Doctors: The nearest GP surgery is Lander Medical Practice, about 1.4 km (0.9 miles) away, with 2 practices within 1.6 km (1 mile).
- People: About 250 people lived in the census areas around it in 2021; 52% of households owned their home and 42% of adults held a degree or other higher qualification.
- Crime: 32 crimes were recorded within 250 m between September 2025 and August 2026, most often violence and sexual offences.
- Road safety: No collisions in which someone was hurt were reported on and around it in 2021 to 2025.
£9.99 The Street Dossier Full Report for a home on St Clements Hill: its own records, questions to ask the seller and everything on this page, in one PDF. Choose the home
House sales on this street
| Year | Sales | Median price | Lowest | Highest |
|---|---|---|---|---|
| 2024 | 1 | £1,540,000 | £1,540,000 | £1,540,000 |
| 2023 | 1 | £1,325,000 | £1,325,000 | £1,325,000 |
| 2022 | 1 | £1,250,000 | £1,250,000 | £1,250,000 |
| 2021 | 1 | £1,250,000 | £1,250,000 | £1,250,000 |
| 2007 | 1 | £485,000 | £485,000 | £485,000 |
| 2004 | 2 | £647,500 | £645,000 | £650,000 |
| 2002 | 1 | £475,000 | £475,000 | £475,000 |
| 2000 | 1 | £220,000 | £220,000 | £220,000 |
| 1999 | 1 | £300,000 | £300,000 | £300,000 |
| Date | Address | Type | Price | Notes |
|---|---|---|---|---|
| 6 Dec 2023 | LITTLE PENARTH TR1 1NX | Detached | £1,325,000 | |
| 15 Feb 2007 | LITTLE PENARTH TR1 1NX | Detached | £485,000 | |
| 29 Sep 2000 | LITTLE PENARTH TR1 1NX | Detached | £220,000 | |
| 6 Dec 2024 | PENARTH TR1 1NX | Detached | £1,540,000 | |
| 30 Jan 2004 | PENARTH TR1 1NX | Detached | £645,000 | |
| 28 May 2021 | SOUTH PENARTH TR1 1NX | Detached | £1,250,000 | |
| 22 Jan 2002 | SOUTH PENARTH TR1 1NX | Detached | £475,000 | |
| 23 Oct 2024 | THE APPLE CART BARN TR1 1NX | Detached | £150,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 29 Apr 2022 | WEST PENARTH HOUSE TR1 1NX | Detached | £1,250,000 | |
| 27 Jul 2004 | WEST PENARTH HOUSE TR1 1NX | Detached | £650,000 | |
| 11 Jan 1999 | WEST PENARTH HOUSE TR1 1NX | Detached | £300,000 |
House prices and rents in Cornwall
A typical home in Cornwall cost £274,570 in August 2026, 2.9% less than a year before. That is 7% more than five years earlier and 36% more than ten years earlier.
| Home | Typical price, Aug 2026 |
|---|---|
| Detached | £419,340 |
| Semi-detached | £275,595 |
| Terraced | £227,474 |
| Flat or maisonette | £144,637 |
| Bought by a first-time buyer | £226,508 |
Private renters in Cornwall paid £995 a month on average in September 2026, 0.9% more than a year before. That is 27% more than five years earlier.
| Home | Average rent a month, Sep 2026 |
|---|---|
| One bedroom | £685 |
| Two bedrooms | £877 |
| Three bedrooms | £1,073 |
| Four or more bedrooms | £1,496 |
Energy performance certificates
5 homes with a current certificate; median floor area 288 m². Most common: House, detached (3); Bungalow, detached (1); House, semi-detached (1). Built: 2021 (1); 2025 (1); 1950-1966 (1). Tenure at assessment: owner-occupied (5).
Each home's certificates and sales (5 addresses)
Gas and electricity use
Homes with gas used 29,844 kWh of it on average in 2024, 228% more than the district's 9,105 kWh, and 5,729 kWh of electricity, 73% more than the district's 3,321 kWh. There are gas meters for about 83% of the homes.
These are all the homes on the postcode, whatever their size and however many live in them, so they show the kind of homes and heating here rather than what any one home uses. The typical figure is the median: half the homes used less. The district is TR1.
Council tax
What each band costs in Cornwall in 2026-27: Band D £2,591 a year on average, including the police, fire and any county and parish charges.
| A | B | C | D | E | F | G | H |
|---|---|---|---|---|---|---|---|
| £1,727 | £2,015 | £2,303 | £2,591 | £3,167 | £3,742 | £4,318 | £5,182 |
Homes by band in the neighbourhood around this street: most are in band B (36% of about 690 homes).
Planning and heritage
- Conservation area: no postcode centre in this street's postcodes is in one.
- Listed buildings on or by this street: 1.
- Article 4 direction (removing permitted development rights): none recorded, though not every council has published theirs.
- Tree preservation orders: none recorded, though not every council has published theirs.
- Green belt: no.
Listed buildings
- PENARTH AND SOUTH PENARTH, grade II
Brownfield land registered for housing within 1 km (0.6 miles)
- The Former Site Of Tregolls House Tregolls Road Truro TR1 1PX: up to 14 homes, permissioned (570 m (0.4 miles))
Energy projects nearby
No wind turbine or waste plant within 5 km (3.1 miles), and no solar farm, battery site or other project of 1 MW or more within 2 km (1.2 miles), of the street's postcodes, operating or planned.
Roadworks
No street works under way, planned or finished in the last three months on this street, in permits up to 31 October 2026.
Flood risk
No address in this street's postcodes is in an area at high, medium or low risk of flooding from rivers, the sea or surface water. The rest are in areas at very low risk: less than a 0.1% (1 in 1,000) chance a year.
Rivers and the sea alone: no home is in an area at risk.
High: 3.3% (1 in 30) or more chance of flooding a year. Medium: 1% to 3.3%. Low: 0.1% to 1%. Very low: under 0.1%. The rivers and sea figures allow for flood defences. Counts cover whole postcodes, which can include other streets.
Flood zone for planning: no postcode centre is in flood zone 2 or 3.
Recorded floods
No recorded flood covers the centre of this street's postcodes.
Recorded floods are where floodwater was seen or surveyed after a flood. Many floods were never mapped, an outline over a postcode's centre does not mean every home in it flooded, and homes outside one may have. Ask the seller whether the home itself has flooded.
Coastal erosion
The nearest projected erosion zone is 700 m (0.4 miles) from the street's postcodes (by 2105, with the shoreline management plan carried out).
| Projection | Policy for the frontage | Erosion | Distance |
|---|---|---|---|
| By 2055, with the shoreline management plan carried out | Managed realignment Rame Head to Hartland Point | up to 2 m | 700 m (0.4 miles) |
| By 2105, with the shoreline management plan carried out | Managed realignment Rame Head to Hartland Point | up to 6 m | 700 m (0.4 miles) |
| By 2105, if defences are not maintained or built | No intervention Rame Head to Hartland Point | up to 6 m | 700 m (0.4 miles) |
Each shoreline management plan sets a policy for each stretch of coast: hold the line (keep defences where they are), managed realignment (let the shore move back in a controlled way), advance the line, or no active intervention. Erosion is the distance the shore may move back, counted from today, for the higher central climate change allowance. The maps are guidance from national modelling, not a survey of any one home; the council's coastal team can say more.
Storm overflows
6 storm overflows within 1 km (0.6 miles) of the street's postcodes spilled 77 times, for 61 hours in all, in 2025. They discharge into River Allen Via Sws(Estuarine), River Allen(Estuarine) Via Sws, River Kenwyn(E), Truro River (Estuarine) and others.
| Overflow | Into | Spills | Hours | Distance |
|---|---|---|---|---|
| St Clement's Hill Cso South West Water | River Allen Via Sws(Estuarine) | 4 | 2 | 780 m (0.5 miles) |
| Trelander Highway Cso South West Water | River Allen(Estuarine) Via Sws | 46 | 32 | 790 m (0.5 miles) |
| Fairmantle Street Cso South West Water | River Kenwyn(E) | 2 | 1 | 840 m (0.5 miles) |
| Newham Road Pumping Station South West Water | Truro River (Estuarine) | 5 | 9 | 870 m (0.5 miles) |
| Morlaix Avenue (Fyffes Slipway) Cso South West Water | Trib of Truro River(Estuarine) | 2 | 1 | 890 m (0.6 miles) |
| Old Bridge Street Car Park Cso South West Water | River Allen | 18 | 18 | 940 m (0.6 miles) |
A storm overflow lets sewage diluted with rainwater into a river, stream or the sea when heavy rain overwhelms the sewers, so the spills here affect the water they run into, not homes. A spill is counted the regulators' way: a first 12 hours, then each 24 hours it goes on.
Coal mining
No postcode centre here is in a coalfield: the Mining Remediation Authority records no coal mining risk here.
Radon
The postcode is in a 1 km square with radon potential up to 30% or more: up to that share of homes there is estimated to be at or above the Action Level of 200 becquerels per cubic metre. At least part of the square is a radon Affected Area, where 1% or more of homes are.
Radon is a natural radioactive gas from the ground that can build up indoors; long exposure raises the risk of lung cancer. A three-month test with two small detectors is the only way to know a home's level, and a high level can usually be brought down with a sump or better ventilation. Homes built here in recent decades should have radon protection under the building regulations (basic protection from 3%, full protection from 10%). UKHSA sells a radon report for a single address from its detailed map at ukradon.org.
Historic landfill
No historic landfill site is within 500 m (0.3 miles) of the street's postcodes.
Height above sea level
The street's 8 addresses are between 55 m and 62 m above sea level (60 m on average); the ground rises about 7 m from the lowest to the highest.
Broadband
| Postcode | Superfast (30 Mbit/s+) | Ultrafast (300 Mbit/s+) | Gigabit | Below 10 Mbit/s |
|---|---|---|---|---|
| TR1 1NX | 86% | 86% | 86% | 0% |
Getting around
| Nearest | Distance | |
|---|---|---|
| Railway stations | Truro 1.3 million journeys in 2024–25 | 2.1 km (1.3 miles) |
| Perranwell 42,000 journeys in 2024–25 | 7.4 km (4.6 miles) | |
| Penryn (Cornwall) 285,000 journeys in 2024–25 | 11.5 km (7.2 miles) | |
| Bus stops | 7 stops within 400 m (0.2 miles), 34 within 800 m (0.5 miles); nearest St Clement Turn Truro | 110 m |
| Bus or coach station | Bus Station Truro | 870 m (0.5 miles) |
| Ferry terminal | Truro Ferry Terminal | 790 m (0.5 miles) |
| Car parks | Old Bridge Street Car Park | 1 km (0.6 miles) |
| EV charging points | 1 within 1.6 km (1 mile); nearest Evolt Network | 1.3 km (0.8 miles) |
| Airport with scheduled flights | Cornwall Airport Newquay NQY | 20.1 km (12 miles) |
| Nearest large airport | Cardiff International Airport CWL | 174 km (108 miles) |
Local services
| Nearest | Distance | |
|---|---|---|
| GP surgeries | 2 practices within 1.6 km (1 mile); nearest Lander Medical Practice Good May 2019 | 1.4 km (0.9 miles) |
| Pharmacies | 5 pharmacies within 1.6 km (1 mile); nearest Tesco Instore Pharmacy | 780 m (0.5 miles) |
| NHS dentists | 12 practices within 1.6 km (1 mile); nearest Trafalgar House Dental Practice | 730 m (0.5 miles) |
| Hospital | Royal Cornwall Hospital (Treliske) Requires improvement Aug 2025 | 4 km (2.5 miles) |
| Care homes | 2 homes within 1.6 km (1 mile); nearest Tregolls Manor Good Oct 2022 | 690 m (0.4 miles) |
| Police station | Devon & Cornwall Police | 1.5 km (0.9 miles) |
| Cash machines | 1 machine within 800 m (0.5 miles); nearest Shell Trafalgar Cashzone | 730 m (0.5 miles) |
Parks and green space
| Nearest | Distance | |
|---|---|---|
| Park or garden | 1 within 800 m (0.5 miles); nearest Furniss Island 3,030 m² | 780 m (0.5 miles) |
| Play area | 6 within 800 m (0.5 miles); nearest Unnamed 1,360 m² | 140 m |
| Playing field | 2 within 800 m (0.5 miles); nearest Unnamed 5,500 m² | 160 m |
| Allotments | Unnamed 5,110 m² | 1.2 km (0.8 miles) |
Within 800 m (0.5 miles): 1 park or garden, 0.3 hectares in all.
Landmarks
The nearest historic landmark is Alverton Manor Hotel, a listed building (Grade II*), 730 m (0.5 miles) north-west. 53 listed buildings are within 1 km (0.6 miles), 5 of them Grade II*.
| Name | What it is | From the middle of the street |
|---|---|---|
| Alverton Manor Hotel | Listed building, Grade II* | 730 m (0.5 miles) north-west |
| Old Mansion House | Listed building, Grade II* | 880 m (0.5 miles) west |
| Penhaligon House, Princes Street Front | Listed building, Grade II* | 920 m (0.6 miles) west |
| Princes House | Listed building, Grade II* | 940 m (0.6 miles) west |
| Standing cross at High Cross, 30m west of Truro Cathedral | Scheduled monument | 1.2 km (0.7 miles) west |
| Early Christian memorial stone and wayside cross in St Clement's churchyard | Scheduled monument | 1.6 km (1 mile) south-east |
| Polwhele Castle: a round with hut circle and field system 160m south west of Higher Tregurra | Scheduled monument | 1.7 km (1 mile) north |
| Cornwall and West Devon Mining Landscape | World Heritage Site | 2.2 km (1.4 miles) north |
| Name | What it is | From the middle of the street |
|---|---|---|
| Lambessow Plantation | Wood | 1 km (0.6 miles) east |
| Tresemple Plantation | Wood | 1.4 km (0.9 miles) east |
| Calenick Creek | Estuary | 1.6 km (1 mile) south |
| Tresemple Pond | Lake or reservoir | 1.8 km (1.1 miles) east |
| Woodcock Corner | Wood | 1.9 km (1.2 miles) north-east |
| Malpas Point | Wetland | 2.2 km (1.4 miles) south-east |
Air quality
| Pollutant | Here | UK limit | WHO guideline |
|---|---|---|---|
| Nitrogen dioxide (NO2) | 4.2 | 40 | 10 |
| Fine particles (PM2.5) | 5.3 | 20 | 5 |
| Particles (PM10) | 10.1 | 40 | 15 |
All three are within the UK legal limits; PM2.5 is above the WHO guideline, as in most towns and cities.
Road and rail noise
| Level | Road traffic | Railways |
|---|---|---|
| Under 55 | 8 | 8 |
None of the street's 8 addresses is modelled at 55 dB or more from road traffic or railways.
Climate, daylight and earthquakes
Monthly temperatures and rainfall, sunrise and sunset through the year, and earthquakes recorded nearby since 1970 are much the same across the area, so they are worked out once for Cornwall: see them on the Cornwall page.
Nearest schools
| School | Phase | Ages | Distance | Inspection | Exam results |
|---|---|---|---|---|---|
| Tregolls Academy | Primary | 2–11 | 480 m (0.3 miles) | Report card (Feb 2026): Curriculum and teaching: Needs attention; Achievement: Needs attention; Attendance and behaviour: Expected standard; Personal development and wellbeing: Expected standard; Inclusion: Needs attention; Leadership and governance: Needs attention; Early years: Needs attention; Safeguarding standards: Met | 47% at the expected standard in reading, writing and maths, 9% at the higher standard (2025; 42% in 2024 and 31% in 2023) |
| Penair School | Secondary | 11–16 | 720 m (0.4 miles) | No published inspection | GCSE 2026 (provisional): Attainment 8 49.4 (49.1 in 2025 and 48.0 in 2024); 50.7% grade 5+ in English and maths |
| Archbishop Benson CofE Primary School Church of England | Primary | 4–11 | 1.2 km (0.7 miles) | No published inspection | 60% at the expected standard in reading, writing and maths, 5% at the higher standard (2025; 61% in 2024 and 60% in 2023) |
| Bosvigo School | Primary | 4–11 | 1.7 km (1 mile) | No published inspection | 47% at the expected standard in reading, writing and maths, 0% at the higher standard (2025; 56% in 2024 and 67% in 2023) |
| Truro Nursery School | Nursery | 2–5 | 1.7 km (1.1 miles) | No published inspection | |
| St Mary's CofE School, Truro Church of England | Primary | 4–11 | 1.7 km (1.1 miles) | No overall grade (Jun 2025, graded inspection without an overall judgement): Quality of education: Good; Behaviour and attitudes: Good; Personal development: Good; Leadership and management: Good | 33% at the expected standard in reading, writing and maths, 0% at the higher standard (2025; 59% in 2024 and 59% in 2023) |
Exam results are from the Department for Education's school performance tables (Explore Education Statistics, Open Government Licence), for all pupils at each school. The middle school in England had 63% at the expected standard at the end of primary school (2025), Attainment 8 of 46.0 at GCSE (2026) and an A level average of C+ (2025). Attainment 8 adds up a pupil's grades in eight GCSEs, with English and maths counted twice (90 is the most), averaged over the school's pupils. Progress 8 compares pupils with others who had the same results at the end of primary school; it is not published for GCSEs in 2025 and 2026, as those pupils sat no primary tests during the pandemic. Small year groups swing from year to year, and figures for very small ones are withheld.
Nurseries and childcare
4 nurseries, pre-schools and clubs within 1.5 km (0.9 miles), the nearest 700 m (0.4 miles) from the middle of the street.
| Provider | Kind | Places | Latest inspection | Distance |
|---|---|---|---|---|
| Stagecoach Truro TR1 1TN | Sessional day care (over fives) | Not inspected yet | 700 m (0.4 miles) | |
| Happy Days Penair TR1 1TN | Full day care | 64 | Outstanding (Jun 2025, overall grade under the previous framework) | 700 m (0.4 miles) |
| Little Minnows TR1 2PE | Full day care | 55 | Good (Jun 2023, overall grade under the previous framework) | 1.3 km (0.8 miles) |
| Player Ready Truro TR1 2SF | Out-of-school day care (over fives) | Not inspected yet | 1.3 km (0.8 miles) |
Ofsted also registers 158 childminders and 20 home childcarers (nannies) in Cornwall. It does not publish their addresses, so they cannot be shown here; the council's family information service lists those taking children.
Food hygiene ratings nearby
| Business | Type | Distance | Rating | Rated |
|---|---|---|---|---|
| Trelander Cafe TR1 1PG | Restaurant/Cafe/Canteen | 160 m | 5 Very good | 15 May 2025 |
| The Sea Bean TR1 1XR | Mobile caterer | 310 m | 4 Good | 4 Jun 2026 |
| Trelander Stores TR1 1FX | Retailers - other | 380 m | 3 Generally satisfactory | 21 May 2025 |
| Trelander Jacks Fish And Chips TR1 1FX | Takeaway/sandwich shop | 380 m | 5 Very good | 2 Oct 2024 |
| Tregolls School Academy TR1 1LH | School/college/university | 480 m (0.3 miles) | 5 Very good | 17 Sep 2026 |
| Truro School TR1 1TH | School/college/university | 490 m (0.3 miles) | 5 Very good | 8 Dec 2025 |
| Leiths Cooking School TR1 1TH | School/college/university | 490 m (0.3 miles) | 5 Very good | 26 Jan 2026 |
| Truro School Cafe TR1 1TH | Restaurant/Cafe/Canteen | 490 m (0.3 miles) | 5 Very good | 29 Jun 2026 |
Crime within 250 m
| Category | Crimes |
|---|---|
| Violence and sexual offences | 15 |
| Criminal damage and arson | 6 |
| Public order | 2 |
| Burglary | 2 |
| Vehicle crime | 2 |
| Anti-social behaviour | 2 |
| Drugs | 1 |
| Other theft | 1 |
| Robbery | 1 |
Most of these are attached to: On or near Trelander South (19); On or near Knoll Park (10); On or near Nampara Way (3).
Road safety
No collisions in which someone was hurt were reported on and around the street in 2021 to 2025.
Only collisions in which someone was hurt and which the police were told about are here: damage-only collisions and near misses are not, and some injuries are never reported. Positions are recorded by the police, usually to within a few metres. Each year's figures are published the following September.
Traffic on nearby roads
No traffic count point is within 500 m (0.3 miles) of the street's postcodes. The Department for Transport counts every motorway and A road and only a sample of minor roads, so a quiet residential street usually has none.
People and work
Who lives here
| Around this street | England | |
|---|---|---|
| Median age | 47 | 40 |
| Children under 15 | 13% | 17% |
| Aged 65 and over | 21% | 18% |
Homes
| Around this street | England | |
|---|---|---|
| Owned (outright or with a mortgage) | 52% | 61% |
| Owned outright | 28% | 33% |
| Shared ownership | under 1% | 1% |
| Social rented | 31% | 17% |
| Private rented | 16% | 21% |
Work and commuting
| Around this street | England | |
|---|---|---|
| Adults (16 and over) in work | 57% | 57% |
| Unemployment (of those working or looking for work) | 5% | 6% |
| Retired (of adults) | 23% | 22% |
| Long-term sick or disabled (of adults) | 8% | 4% |
| Work mainly from home (of those in work) | 26% | 32% |
| Travel to work by car or van | 61% | 48% |
| By train, Underground, metro or tram | 0% | 4% |
| By any public transport, including bus | 2% | 8% |
| On foot or by bicycle | 9% | 10% |
| Work within 10 km (6 miles) of home (of those who travel to work) | 66% | 65% |
| Work 30 km (19 miles) or more away | 5% | 8% |
Education and languages
| Around this street | England | |
|---|---|---|
| Degree or other higher qualification, Level 4+ (of adults) | 42% | 34% |
| No qualifications | 17% | 18% |
| Apprenticeship as highest qualification | 2% | 5% |
| Main language English (aged 3 and over) | 98% | 91% |
| Cannot speak English well or at all | 0% | 2% |
Deprivation
The neighbourhood around this street is in decile 3 of 10 on the English Indices of Deprivation 2025, where 1 is the most deprived tenth of England's 33,755 neighbourhoods and 10 the least.
What has changed
Nothing new since the change feed started on 30 October 2026. New sales and energy certificates, and hygiene ratings, school inspections and flood figures nearby, will be listed here as the sources update.
Postcodes on this street
- TR1 1NX: 8 addresses of 9 in the postcode
Nearby streets
Nampara Way · Knoll Park · Trelander South · St Clements Parc · St Clement's Close · Trelander East · Penair View · Bar Meadows · Tregolls Road
What this page cannot tell you
- Whether a particular house is at risk of flooding, subsiding or anything else: the flood map is a model of areas and there is no property-level data here.
- What a home is worth now: sales are historic prices for the homes that happened to sell.
- How safe the street is: crime points are moved to anonymised locations and many crimes are never reported; road collisions count only those in which someone was hurt and the police were told.
- Whether you would get a place at a school: distances are straight lines, not catchments.
- Who lives on the street now: census figures describe the small areas around it in March 2021, during a lockdown.
- How long a journey takes or how often anything runs: transport distances are straight lines to the nearest stops.
- Whether a GP practice is taking new patients, or a dentist new NHS patients.
- How loud a home is inside, or noise from industry, neighbours or smaller airfields: noise figures are models of road, rail and air traffic outside.
How each figure on this page is matched to the street and worked out: methodology.