City report · Slovakia
Bratislava Air quality today
Air quality in Bratislava currently reads AQI 63 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 63
Moderate
- PM2.5, fine particles (µg/m³)
- 15.6
- tree cover
- 40.8%
- trees in this area
- 117K
- more trees needed
- 0
Measured across a 2 km radius around Old Town, Slovakia (12.57 km²), from a satellite image of Sep 16, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Bratislava · AQI 63 (Moderate)
Bratislava's tree count comes to 116,769 trees across 11.45 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Bratislava today: AQI 63, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 16:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Kittsee, 5.1 km away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
15.6
PM10
17.7
NO₂
19.1
O₃
—
SO₂
2.3
CO
338.5
Data: OpenAQ · EEA
- 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 Bratislava's daily AQI at 79 on average, from 72 on Nov 5 to an hourly peak of 114 on Nov 6.
Where Bratislava stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Bratislava: Healthy tree cover
40.8% tree cover against a 30% healthy-neighborhood target, across 11.45 km² of land.
Trees in this area
116,769
Target trees
116,769
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Bratislava lost?
Since 2001, the area within 10 km of Bratislava has lost about 356 hectares of forest (about 500 football pitches): 3.8% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 28 hectares (7.9%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 6 km southwest of the city center.
- Forest lost since 2001
- 356 haabout 500 football pitches
- Share of its forest
- 3.8%of what there was in 2000
- Cleared for good
- 28 hadeforestation: turned into farms, mines or towns
The worst year was 2010, when about 91 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 | 1 ha | 19 ha | 20 ha |
| 2002 | 1 ha | 13 ha | 15 ha |
| 2003 | 2 ha | 6 ha | 7 ha |
| 2004 | under 1 ha | 6 ha | 6 ha |
| 2005 | 3 ha | 25 ha | 27 ha |
| 2006 | under 1 ha | 2 ha | 2 ha |
| 2007 | 3 ha | 14 ha | 16 ha |
| 2008 | 4 ha | 11 ha | 15 ha |
| 2009 | 1 ha | 20 ha | 21 ha |
| 2010 | 1 ha | 90 ha | 91 ha |
| 2011 | 1 ha | 9 ha | 11 ha |
| 2012 | under 1 ha | 13 ha | 14 ha |
| 2013 | under 1 ha | 8 ha | 8 ha |
| 2014 | 1 ha | 3 ha | 5 ha |
| 2015 | under 1 ha | 4 ha | 4 ha |
| 2016 | under 1 ha | 5 ha | 5 ha |
| 2017 | under 1 ha | 12 ha | 12 ha |
| 2018 | 5 ha | 11 ha | 16 ha |
| 2019 | under 1 ha | 13 ha | 14 ha |
| 2020 | under 1 ha | 5 ha | 5 ha |
| 2021 | under 1 ha | 5 ha | 6 ha |
| 2022 | under 1 ha | 4 ha | 4 ha |
| 2023 | under 1 ha | 19 ha | 19 ha |
| 2024 | 1 ha | 6 ha | 7 ha |
| 2025 | under 1 ha | 6 ha | 6 ha |
What is causing deforestation around Bratislava?
- Loggingcan grow back89% · 317 ha
- Towns and roadscleared for good7.9% · 28 ha
- Unknown causescause unknown3.1% · 11 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
- 11,700 ha
- Forest in 2020
- 12,100 ha
- Overall change
- +368 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Bratislava grew from about 11,700 hectares to 12,100 hectares, a net gain of about 368 hectares (+3.1%). New forest grew on about 493 hectares, while 125 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 Bratislava
Same 2 km radius, same index — so they compare directly.
- Vienna54.9 km
Austria
- Tree cover
- 17%
- Air quality
- 114
- Győr65.0 km
Hungary
- Tree cover
- 28%
- Air quality
- 114
- Brno122.0 km
Czechia
- Tree cover
- 25%
- Air quality
- 67
- Székesfehérvár144.5 km
Hungary
- Tree cover
- 23%
- Air quality
- 55
- Budapest161.4 km
Hungary
- Tree cover
- 29%
- Air quality
- 64
Also compared:Bratislava vs Košice
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Frequently asked
Questions about Bratislava
What is the air quality (AQI) in Bratislava right now?
The latest reading for Bratislava shows an AQI of 63 (Moderate), measured Nov 11, 16:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Kittsee, 5.1 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Bratislava today?
At AQI 63 (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 Bratislava been like this week?
Over the last 7 days, the CAMS air-quality model put Bratislava's daily AQI at 79 on average, from 72 on Nov 5 to an hourly peak of 114 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 Bratislava lost since 2001?
Since 2001, the area within 10 km of Bratislava has lost about 356 hectares of forest (about 500 football pitches): 3.8% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 28 hectares (7.9%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Bratislava grew from about 11,700 hectares to 12,100 hectares, a net gain of about 368 hectares (+3.1%). New forest grew on about 493 hectares, while 125 hectares were lost.
What is the tree count in Bratislava?
Bratislava has an estimated 116,769 trees across the 11.45 km² of land measured — 40.8% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Bratislava need?
Bratislava has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Bratislava's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Old Town, 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 2 km radius around Old Town; the tree count is an estimate derived from that cover.
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