City report · Czechia
Brno Air quality today
Air quality in Brno currently reads AQI 67 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 67
Moderate
- PM2.5, fine particles (µg/m³)
- 17.8
- tree cover
- 25.4%
- trees in this area
- 79.8K
- more trees needed
- 14.5K
Measured across a 2 km radius around Brno-střed, Czechia (12.57 km²), from a satellite image of Sep 8, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Brno · AQI 67 (Moderate)
Brno's tree count comes to 79,796 trees across 12.57 km², 5 points below the 30% tree-cover level considered healthy for this area, so roughly 14,451 more trees would close the gap.
Air quality detail
Air quality in Brno today: AQI 67, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 14:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Brno-Arboretum, Jihomoravsky, Czech Republic, 2.4 km away · median of 3 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
17.8
PM10
21.6
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Czech Hydrometeorological Institute (Český hydrometeorologický ústav)
- 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 Brno's daily AQI at 74 on average, from 57 on Nov 4 to an hourly peak of 102 on Nov 8.
Where Brno stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Brno: Below target
25.4% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
79,796
Target trees
94,247
More trees needed
14,451
CO₂ if planted / yr
317.9 t
Deforestation · 2001–2025
How much forest has Brno lost?
Since 2001, the area within 10 km of Brno has lost about 807 hectares of forest (about 1,100 football pitches): 8.5% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 40 hectares (5%) was deforestation: forest cleared for good for farms, mines or towns.
2018: satellite photo from September 2018 of a 5 × 5 km area about 7 km northeast of the city center.
- Forest lost since 2001
- 807 haabout 1,100 football pitches
- Share of its forest
- 8.5%of what there was in 2000
- Cleared for good
- 40 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 20 hectares a year in 2021–2025, down from 53 hectares a year in 2016–2020. The worst year was 2005, when about 144 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 | 14 ha | 15 ha |
| 2002 | under 1 ha | 10 ha | 11 ha |
| 2003 | under 1 ha | 17 ha | 17 ha |
| 2004 | under 1 ha | 4 ha | 4 ha |
| 2005 | 9 ha | 135 ha | 144 ha |
| 2006 | under 1 ha | 13 ha | 13 ha |
| 2007 | 1 ha | 51 ha | 52 ha |
| 2008 | 1 ha | 21 ha | 22 ha |
| 2009 | 8 ha | 12 ha | 19 ha |
| 2010 | 3 ha | 11 ha | 14 ha |
| 2011 | 2 ha | 51 ha | 53 ha |
| 2012 | 5 ha | 32 ha | 37 ha |
| 2013 | under 1 ha | 11 ha | 11 ha |
| 2014 | under 1 ha | 21 ha | 22 ha |
| 2015 | under 1 ha | 8 ha | 8 ha |
| 2016 | under 1 ha | 16 ha | 17 ha |
| 2017 | under 1 ha | 23 ha | 23 ha |
| 2018 | under 1 ha | 31 ha | 32 ha |
| 2019 | 1 ha | 104 ha | 105 ha |
| 2020 | under 1 ha | 88 ha | 88 ha |
| 2021 | 4 ha | 12 ha | 15 ha |
| 2022 | under 1 ha | 16 ha | 16 ha |
| 2023 | under 1 ha | 21 ha | 21 ha |
| 2024 | under 1 ha | 14 ha | 14 ha |
| 2025 | under 1 ha | 34 ha | 34 ha |
What is causing deforestation around Brno?
- Loggingcan grow back93% · 754 ha
- Towns and roadscleared for good4.8% · 39 ha
- Unknown causescause unknown1.8% · 14 ha
Also: farms, pasture and plantations.
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
- 13,100 ha
- Overall change
- +590 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Brno grew from about 12,600 hectares to 13,100 hectares, a net gain of about 590 hectares (+4.7%). New forest grew on about 688 hectares, while 99 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 Brno
Same 2 km radius, same index — so they compare directly.
- Vienna111.1 km
Austria
- Tree cover
- 17%
- Air quality
- 114
- Bratislava122.0 km
Slovakia
- Tree cover
- 41%
- Air quality
- 63
- Nitra146.5 km
Slovakia
- Tree cover
- 35%
- Air quality
- 53
- Žilina154.9 km
Slovakia
- Tree cover
- 30%
- Air quality
- 63
- Rybnik171.6 km
Poland
- Tree cover
- 42%
- Air quality
- 79
Also compared:Brno vs Prague
Build your own
Compare Brno with anywhere
This place
Brno
Use this data
Put Brno's numbers on your site
Free to embed. Updates itself as the measurement refreshes.
Frequently asked
Questions about Brno
What is the air quality (AQI) in Brno right now?
The latest reading for Brno shows an AQI of 67 (Moderate), measured Nov 11, 14:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Brno-Arboretum, Jihomoravsky, Czech Republic, 2.4 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Brno today?
At AQI 67 (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 Brno been like this week?
Over the last 7 days, the CAMS air-quality model put Brno's daily AQI at 74 on average, from 57 on Nov 4 to an hourly peak of 102 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 Brno lost since 2001?
Since 2001, the area within 10 km of Brno has lost about 807 hectares of forest (about 1,100 football pitches): 8.5% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 40 hectares (5%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 20 hectares a year in 2021–2025, down from 53 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Brno grew from about 12,600 hectares to 13,100 hectares, a net gain of about 590 hectares (+4.7%). New forest grew on about 688 hectares, while 99 hectares were lost.
What is the tree count in Brno?
Brno has an estimated 79,796 trees across the 12.57 km² measured — 25.4% tree cover, 5 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Brno need?
Brno needs roughly 14,451 more trees to close a 5-point shortfall against its 30% tree-cover target — about 317.9 t of extra CO₂ absorbed per year once grown.
How are Brno's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Brno-střed, 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 Brno-střed; the tree count is an estimate derived from that cover.
See your own area
What does your neighborhood look like?
Pick any point and radius to get the same air-quality and tree-cover breakdown.
Check my address