City report · Slovakia
Žilina Air quality today
Air quality in Žilina 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)
- 15.4
- tree cover
- 29.8%
- trees in this area
- 92.2K
- more trees needed
- 619
Measured across a 2 km radius around Žilina, Slovakia (12.57 km²), from a satellite image of Sep 15, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Žilina · AQI 63 (Moderate)
Žilina's tree count comes to 92,215 trees across 12.38 km² of land, 0 points below the 30% tree-cover level considered healthy for this area, so roughly 619 more trees would close the gap.
Air quality detail
Air quality in Žilina 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 · "Zilina - Obezna", 2.6 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
15.4
PM10
22.2
NO₂
34.2
O₃
15.3
SO₂
—
CO
—
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 Žilina's daily AQI at 62 on average, from 43 on Nov 4 to an hourly peak of 98 on Nov 9.
Where Žilina stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Žilina: Below target
29.8% tree cover against a 30% healthy-neighborhood target, across 12.38 km² of land.
Trees in this area
92,215
Target trees
92,834
More trees needed
619
CO₂ if planted / yr
13.6 t
Deforestation · 2001–2025
How much forest has Žilina lost?
Since 2001, the area within 10 km of Žilina has lost about 2,940 hectares of forest (about 4,100 football pitches): 20% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 50 hectares (1.7%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 5 km northeast of the city center.
- Forest lost since 2001
- 2,940 haabout 4,100 football pitches
- Share of its forest
- 20%of what there was in 2000
- Cleared for good
- 50 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 89 hectares a year in 2021–2025, down from 257 hectares a year in 2016–2020. The worst year was 2019, when about 354 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 | 13 ha | 14 ha |
| 2002 | 1 ha | 42 ha | 43 ha |
| 2003 | under 1 ha | 18 ha | 18 ha |
| 2004 | under 1 ha | 27 ha | 27 ha |
| 2005 | 3 ha | 150 ha | 153 ha |
| 2006 | 12 ha | 30 ha | 41 ha |
| 2007 | 2 ha | 93 ha | 95 ha |
| 2008 | 2 ha | 105 ha | 107 ha |
| 2009 | 2 ha | 112 ha | 114 ha |
| 2010 | 6 ha | 168 ha | 174 ha |
| 2011 | under 1 ha | 92 ha | 93 ha |
| 2012 | under 1 ha | 141 ha | 141 ha |
| 2013 | under 1 ha | 57 ha | 58 ha |
| 2014 | 3 ha | 85 ha | 88 ha |
| 2015 | under 1 ha | 40 ha | 41 ha |
| 2016 | 2 ha | 188 ha | 190 ha |
| 2017 | 2 ha | 168 ha | 170 ha |
| 2018 | under 1 ha | 319 ha | 320 ha |
| 2019 | 2 ha | 353 ha | 354 ha |
| 2020 | 6 ha | 245 ha | 251 ha |
| 2021 | 2 ha | 107 ha | 108 ha |
| 2022 | 2 ha | 67 ha | 69 ha |
| 2023 | under 1 ha | 97 ha | 98 ha |
| 2024 | under 1 ha | 93 ha | 93 ha |
| 2025 | under 1 ha | 78 ha | 78 ha |
What is causing deforestation around Žilina?
- Loggingcan grow back98% · 2,880 ha
- Towns and roadscleared for good1.7% · 50 ha
Also: 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
- 14,600 ha
- Forest in 2020
- 13,400 ha
- Overall change
- −1,200 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Žilina shrank from about 14,600 hectares to 13,400 hectares, a net loss of about 1,200 hectares (−8.2%). New forest grew on about 213 hectares, but 1,410 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 Žilina
Same 2 km radius, same index — so they compare directly.
- Bielsko-Biala70.2 km
Poland
- Tree cover
- 42%
- Air quality
- 84
- Ostrava75.6 km
Czechia
- Tree cover
- 40%
- Air quality
- 72
- Rybnik98.2 km
Poland
- Tree cover
- 42%
- Air quality
- 79
- Tychy102.9 km
Poland
- Tree cover
- 44%
- Air quality
- 115
- Ruda Śląska115.4 km
Poland
- Tree cover
- 57%
- Air quality
- 108
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Frequently asked
Questions about Žilina
What is the air quality (AQI) in Žilina right now?
The latest reading for Žilina shows an AQI of 63 (Moderate), measured Nov 11, 16:00 local time by the "Zilina - Obezna" ground monitoring station, 2.6 km 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 Žilina 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 Žilina been like this week?
Over the last 7 days, the CAMS air-quality model put Žilina's daily AQI at 62 on average, from 43 on Nov 4 to an hourly peak of 98 on Nov 9. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Žilina lost since 2001?
Since 2001, the area within 10 km of Žilina has lost about 2,940 hectares of forest (about 4,100 football pitches): 20% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 50 hectares (1.7%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 89 hectares a year in 2021–2025, down from 257 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Žilina shrank from about 14,600 hectares to 13,400 hectares, a net loss of about 1,200 hectares (−8.2%). New forest grew on about 213 hectares, but 1,410 hectares were lost.
What is the tree count in Žilina?
Žilina has an estimated 92,215 trees across the 12.38 km² of land measured — 29.8% tree cover, 0 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Žilina need?
Žilina needs roughly 619 more trees to close a 0-point shortfall against its 30% tree-cover target — about 13.6 t of extra CO₂ absorbed per year once grown.
How are Žilina's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Žilina, 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 Žilina; the tree count is an estimate derived from that cover.
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