City report · Guernsey
Saint Peter Port Air quality today
Air quality in Saint Peter Port currently reads AQI 24 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 24
Good
- PM2.5, fine particles (µg/m³)
- 3.7
- tree cover
- 36.3%
- trees in this area
- 66.9K
- more trees needed
- 0
Measured across a 2 km radius around Saint Peter Port, Bailiwick of Guernsey, Guernsey (12.57 km²), from a satellite image of Sep 12, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Saint Peter Port · AQI 24 (Good)
Saint Peter Port's tree count comes to 66,941 trees across 7.38 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Saint Peter Port today: AQI 24, Good
Main pollutant: PM2.5 · Observed Nov 11, 09:00 local time via Open-Meteo / CAMS, corrected with 8 ground-station cities within 205 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 8 station cities within 205 km, e.g. Saint Helier and Bournemouth
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.7
PM10
7.2
NO₂
1.3
O₃
67.0
SO₂
0.1
CO
128.0
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Saint Peter Port's daily AQI at 46 on average, from 21 on Nov 11 to an hourly peak of 63 on Nov 6.
Where Saint Peter Port stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Saint Peter Port: Healthy tree cover
36.3% tree cover against a 30% healthy-neighborhood target, across 7.38 km² of land.
Trees in this area
66,941
Target trees
66,941
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Saint Peter Port lost?
Since 2001, the area within 10 km of Saint Peter Port has lost about 8 hectares of forest (about 12 football pitches): under 1% of the forest it had in 2000. Most of it (55%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 8 haabout 12 football pitches
- Share of its forest
- under 1%of what there was in 2000
- Cleared for good
- 5 hadeforestation: turned into farms, mines or towns
The worst year was 2012, when about 3 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 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 2 ha | under 1 ha | 3 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Saint Peter Port?
- Towns and roadscleared for good51% · 4 ha
- Unknown causescause unknown43% · 4 ha
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
- 1,480 ha
- Forest in 2020
- 1,510 ha
- Overall change
- +37 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Saint Peter Port grew from about 1,480 hectares to 1,510 hectares, a net gain of about 37 hectares (+2.5%). New forest grew on about 63 hectares, while 26 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 Saint Peter Port
Same 2 km radius, same index — so they compare directly.
- Saint Helier43.4 km
Jersey
- Tree cover
- 26%
- Air quality
- 36
- Bournemouth147.8 km
United Kingdom
- Tree cover
- 50%
- Air quality
- 58
- Plymouth153.4 km
United Kingdom
- Tree cover
- 18%
- Air quality
- 42
- Exeter157.3 km
United Kingdom
- Tree cover
- 24%
- Air quality
- 80
- Caen160.6 km
France
- Tree cover
- 24%
- Air quality
- 34
- Rennes162.7 km
France
- Tree cover
- 28%
- Air quality
- 40
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Frequently asked
Questions about Saint Peter Port
What is the air quality (AQI) in Saint Peter Port right now?
The latest reading for Saint Peter Port shows an AQI of 24 (Good), observed Nov 11, 09:00 local time via Open-Meteo / CAMS, corrected with 8 ground-station cities within 205 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Saint Peter Port today?
At AQI 24 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Saint Peter Port been like this week?
Over the last 7 days, the CAMS air-quality model put Saint Peter Port's daily AQI at 46 on average, from 21 on Nov 11 to an hourly peak of 63 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Saint Peter Port lost since 2001?
Since 2001, the area within 10 km of Saint Peter Port has lost about 8 hectares of forest (about 12 football pitches): under 1% of the forest it had in 2000. Most of it (55%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Saint Peter Port grew from about 1,480 hectares to 1,510 hectares, a net gain of about 37 hectares (+2.5%). New forest grew on about 63 hectares, while 26 hectares were lost.
What is the tree count in Saint Peter Port?
Saint Peter Port has an estimated 66,941 trees across the 7.38 km² of land measured — 36.3% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Saint Peter Port need?
Saint Peter Port has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Saint Peter Port's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Saint Peter Port; the tree count is an estimate derived from that cover.
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