City report · England, United Kingdom
Southampton Air quality today
Air quality in Southampton currently reads AQI 60 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 60
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 14.0
- tree cover
- 16.8%
- trees in this area
- 37.2K
- more trees needed
- 29.2K
Measured across a 1.2 mi (2 km) radius around Southampton City Centre, Southampton, UK (4.9 sq mi), from a satellite image of Aug 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Southampton · AQI 60 (Moderate)
Southampton's tree count comes to 37,156 trees across 3.4 sq mi (8.85 km²) of land, 13 points below the 30% tree-cover level considered healthy for this area, so roughly 29,194 more trees would close the gap.
Air quality detail
Air quality in Southampton today: AQI 60, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 15:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Southampton Centre, United Kingdom, 0.5 mi (800 m) away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
14.0
PM10
18.4
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, UK-AIR, air quality information resource - Defra, UK
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Southampton's daily AQI at 68 on average, from 45 on Nov 4 to an hourly peak of 88 on Nov 8.
This is the US EPA AQI. How it differs from the UK's Daily Air Quality Index
Where Southampton stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Southampton: Critically low
16.8% tree cover against a 30% healthy-neighborhood target, across 3.4 sq mi (8.85 km²) of land.
Trees in this area
37,156
Target trees
66,350
More trees needed
29,194
CO₂ if planted / yr
642.3 t
Deforestation · 2001–2025
How much forest has Southampton lost?
Since 2001, the area within 10 km of Southampton has lost about 261 hectares of forest (about 370 football pitches): 3.7% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 31 hectares (12%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km southwest of the city center.
- Forest lost since 2001
- 261 haabout 370 football pitches
- Share of its forest
- 3.7%of what there was in 2000
- Cleared for good
- 31 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 33 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 16 ha | 17 ha | 33 ha |
| 2002 | under 1 ha | 3 ha | 4 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 3 ha | 11 ha | 14 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 2 ha | 26 ha | 28 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | 13 ha | 13 ha |
| 2009 | 3 ha | 11 ha | 14 ha |
| 2010 | under 1 ha | 23 ha | 23 ha |
| 2011 | under 1 ha | 3 ha | 4 ha |
| 2012 | under 1 ha | 14 ha | 14 ha |
| 2013 | under 1 ha | 8 ha | 9 ha |
| 2014 | 1 ha | 11 ha | 12 ha |
| 2015 | under 1 ha | 19 ha | 20 ha |
| 2016 | under 1 ha | 12 ha | 12 ha |
| 2017 | 2 ha | 7 ha | 9 ha |
| 2018 | under 1 ha | 8 ha | 8 ha |
| 2019 | under 1 ha | 4 ha | 4 ha |
| 2020 | under 1 ha | 9 ha | 9 ha |
| 2021 | under 1 ha | 9 ha | 9 ha |
| 2022 | under 1 ha | 5 ha | 6 ha |
| 2023 | under 1 ha | 3 ha | 3 ha |
| 2024 | under 1 ha | 6 ha | 6 ha |
| 2025 | under 1 ha | 9 ha | 9 ha |
What is causing deforestation around Southampton?
- Loggingcan grow back79% · 206 ha
- Towns and roadscleared for good8.8% · 23 ha
- Farms, pasture and plantationscleared for good3.1% · 8 ha
Also: storms, floods and other natural causes, wildfires, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 11,500 ha
- Forest in 2020
- 11,900 ha
- Overall change
- +409 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Southampton grew from about 11,500 hectares to 11,900 hectares, a net gain of about 409 hectares (+3.6%). New forest grew on about 598 hectares, while 189 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
In the same region
Measured cities near Southampton
Same 2 km radius, same index — so they compare directly.
- Portsmouth24.9 km
United Kingdom
- Tree cover
- 10%
- Air quality
- 56
- Bournemouth39.1 km
United Kingdom
- Tree cover
- 50%
- Air quality
- 61
- Basingstoke45.6 km
United Kingdom
- Tree cover
- 33%
- Air quality
- 53
- Reading68.4 km
United Kingdom
- Tree cover
- 28%
- Air quality
- 83
- Worthing72.8 km
United Kingdom
- Tree cover
- 13%
- Air quality
- 66
- Woking74.9 km
United Kingdom
- Tree cover
- 54%
- Air quality
- 100
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Frequently asked
Questions about Southampton
What is the air quality (AQI) in Southampton right now?
The latest reading for Southampton shows an AQI of 60 (Moderate), measured Nov 11, 15:00 local time by the Southampton Centre, United Kingdom ground monitoring station, 0.5 mi (800 m) away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Southampton today?
At AQI 60 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Southampton been like this week?
Over the last 7 days, the CAMS air-quality model put Southampton's daily AQI at 68 on average, from 45 on Nov 4 to an hourly peak of 88 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Southampton's AQI the same as the UK's Daily Air Quality Index?
No. Airleaf shows the US EPA Air Quality Index (AQI), the scale used by IQAir and most air-quality apps. The UK's Daily Air Quality Index (DAQI), published by Defra, runs from 1 to 10: 1–3 low, 4–6 moderate, 7–9 high and 10 very high. It is a different scale altogether, so a US AQI figure can't be read on it directly; both, though, are built from the same main pollutants, with fine particles (PM2.5) usually the one that decides the reading.
How much forest has the area around Southampton lost since 2001?
Since 2001, the area within 10 km of Southampton has lost about 261 hectares of forest (about 370 football pitches): 3.7% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 31 hectares (12%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Southampton grew from about 11,500 hectares to 11,900 hectares, a net gain of about 409 hectares (+3.6%). New forest grew on about 598 hectares, while 189 hectares were lost.
What is the tree count in Southampton?
Southampton has an estimated 37,156 trees across the 3.4 sq mi (8.85 km²) of land measured — 16.8% tree cover, 13 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Southampton need?
Southampton needs roughly 29,194 more trees to close a 13-point shortfall against its 30% tree-cover target — about 642.3 t of extra CO₂ absorbed per year once grown.
How are Southampton's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Southampton City Centre, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 1.2 mi (2 km) radius around Southampton City Centre; the tree count is an estimate derived from that cover.
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