City report · Friuli Venezia Giulia, Italy
Trieste Air quality today
Air quality in Trieste currently reads AQI 52 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 52
Moderate
- PM2.5, fine particles (µg/m³)
- 9.8
- tree cover
- 26.6%
- trees in this area
- 72.0K
- more trees needed
- 9.2K
Measured across a 2 km radius around Trieste, Province of Trieste, Italy (12.57 km²), from a satellite image of Sep 26, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Trieste · AQI 52 (Moderate)
Trieste's tree count comes to 71,951 trees across 10.82 km² of land, 3 points below the 30% tree-cover level considered healthy for this area, so roughly 9,197 more trees would close the gap.
Air quality detail
Air quality in Trieste today: AQI 52, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 03:00 local time via Open-Meteo / CAMS, corrected with 6 ground-station cities within 145 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 6 station cities within 145 km, e.g. Udine and Rijeka
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
9.8
PM10
15.0
NO₂
23.2
O₃
21.0
SO₂
1.2
CO
270.0
- 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 Trieste's daily AQI at 56 on average, from 44 on Nov 10 to an hourly peak of 75 on Nov 8.
Where Trieste stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Trieste: Below target
26.6% tree cover against a 30% healthy-neighborhood target, across 10.82 km² of land.
Trees in this area
71,951
Target trees
81,148
More trees needed
9,197
CO₂ if planted / yr
202.3 t
Deforestation · 2001–2025
How much forest has Trieste lost?
Since 2001, the area within 10 km of Trieste has lost about 262 hectares of forest (about 370 football pitches): 2.6% of the forest it had in 2000. The biggest cause was logging (32%), after which forest can grow back. About 114 hectares (44%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km southeast of the city center.
- Forest lost since 2001
- 262 haabout 370 football pitches
- Share of its forest
- 2.6%of what there was in 2000
- Cleared for good
- 114 hadeforestation: turned into farms, mines or towns
The worst year was 2023, when about 45 hectares of forest were lost, mostly to wildfires.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 2 ha | under 1 ha | 3 ha |
| 2002 | under 1 ha | 4 ha | 4 ha |
| 2003 | 2 ha | under 1 ha | 2 ha |
| 2004 | 1 ha | under 1 ha | 2 ha |
| 2005 | 3 ha | 1 ha | 4 ha |
| 2006 | 18 ha | 7 ha | 24 ha |
| 2007 | 7 ha | 7 ha | 14 ha |
| 2008 | 2 ha | under 1 ha | 3 ha |
| 2009 | 8 ha | 30 ha | 38 ha |
| 2010 | 1 ha | 1 ha | 3 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 4 ha | 4 ha | 8 ha |
| 2013 | under 1 ha | 1 ha | 2 ha |
| 2014 | 2 ha | 5 ha | 7 ha |
| 2015 | 1 ha | under 1 ha | 2 ha |
| 2016 | under 1 ha | under 1 ha | 2 ha |
| 2017 | 2 ha | 2 ha | 4 ha |
| 2018 | 7 ha | 1 ha | 8 ha |
| 2019 | 6 ha | 3 ha | 9 ha |
| 2020 | 21 ha | 1 ha | 22 ha |
| 2021 | 18 ha | 3 ha | 21 ha |
| 2022 | 1 ha | 23 ha | 25 ha |
| 2023 | under 1 ha | 45 ha | 45 ha |
| 2024 | 2 ha | 2 ha | 4 ha |
| 2025 | 4 ha | 2 ha | 6 ha |
What is causing deforestation around Trieste?
- Loggingcan grow back32% · 84 ha
- Towns and roadscleared for good29% · 75 ha
- Wildfirescan grow back21% · 54 ha
Also: farms, pasture and plantations, mining and energy, 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
- 12,600 ha
- Forest in 2020
- 12,700 ha
- Overall change
- +102 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Trieste stayed about the same size, at about 12,700 hectares: new forest grew on about 226 hectares, and about 124 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 Trieste
Same 2 km radius, same index — so they compare directly.
- Udine62.7 km
Italy
- Tree cover
- 24%
- Air quality
- 99
- Rijeka63.1 km
Croatia
- Tree cover
- 44%
- Air quality
- 53
- Ljubljana71.9 km
Slovenia
- Tree cover
- 38%
- Air quality
- 69
- Novo Mesto109.4 km
Slovenia
- Tree cover
- 41%
- Air quality
- 54
- Klagenfurt am Wörthersee115.8 km
Austria
- Tree cover
- 26%
- Air quality
- 52
- Mestre120.5 km
Italy
- Tree cover
- 21%
- Air quality
- 134
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Frequently asked
Questions about Trieste
What is the air quality (AQI) in Trieste right now?
The latest reading for Trieste shows an AQI of 52 (Moderate), observed Nov 11, 03:00 local time via Open-Meteo / CAMS, corrected with 6 ground-station cities within 145 km, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Trieste today?
At AQI 52 (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 Trieste been like this week?
Over the last 7 days, the CAMS air-quality model put Trieste's daily AQI at 56 on average, from 44 on Nov 10 to an hourly peak of 75 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Trieste lost since 2001?
Since 2001, the area within 10 km of Trieste has lost about 262 hectares of forest (about 370 football pitches): 2.6% of the forest it had in 2000. The biggest cause was logging (32%), after which forest can grow back. About 114 hectares (44%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Trieste stayed about the same size, at about 12,700 hectares: new forest grew on about 226 hectares, and about 124 hectares were lost.
What is the tree count in Trieste?
Trieste has an estimated 71,951 trees across the 10.82 km² of land measured — 26.6% tree cover, 3 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Trieste need?
Trieste needs roughly 9,197 more trees to close a 3-point shortfall against its 30% tree-cover target — about 202.3 t of extra CO₂ absorbed per year once grown.
How are Trieste'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 Trieste; the tree count is an estimate derived from that cover.
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