City report · Warmia-Masuria, Poland
Olsztyn Air quality today
Air quality in Olsztyn currently reads AQI 61 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 61
Moderate
- PM2.5, fine particles (µg/m³)
- 14.4
- tree cover
- 39.2%
- trees in this area
- 123K
- more trees needed
- 0
Measured across a 2 km radius around Osiedle Kętrzyńskiego, 10-001 Olsztyn, Poland (12.57 km²), from a satellite image of Sep 3, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Olsztyn · AQI 61 (Moderate)
Olsztyn's tree count comes to 123,027 trees across 12.56 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Olsztyn today: AQI 61, 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 · Olsztyn, ul. Puszkina, 700 m away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
14.4
PM10
16.5
NO₂
5.8
O₃
38.6
SO₂
1.6
CO
246.0
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 Olsztyn's daily AQI at 74 on average, from 42 on Nov 6 to an hourly peak of 139 on Nov 10.
Where Olsztyn stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Olsztyn: Healthy tree cover
39.2% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
123,027
Target trees
123,027
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Olsztyn lost?
Since 2001, the area within 10 km of Olsztyn has lost about 1,310 hectares of forest (about 1,800 football pitches): 11% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 280 hectares (21%) was deforestation: forest cleared for good for farms, mines or towns.
2018: satellite photo from June 2018 of a 5 × 5 km area about 6 km southwest of the city center.
- Forest lost since 2001
- 1,310 haabout 1,800 football pitches
- Share of its forest
- 11%of what there was in 2000
- Cleared for good
- 280 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 52 hectares a year in 2021–2025, down from 78 hectares a year in 2016–2020. The worst year was 2017, when about 152 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 | 5 ha | 23 ha | 27 ha |
| 2002 | 5 ha | 22 ha | 27 ha |
| 2003 | 2 ha | 13 ha | 15 ha |
| 2004 | 11 ha | 26 ha | 37 ha |
| 2005 | 20 ha | 53 ha | 73 ha |
| 2006 | 8 ha | 42 ha | 49 ha |
| 2007 | 7 ha | 19 ha | 25 ha |
| 2008 | 10 ha | 31 ha | 41 ha |
| 2009 | 3 ha | 10 ha | 13 ha |
| 2010 | 17 ha | 112 ha | 129 ha |
| 2011 | 2 ha | 24 ha | 26 ha |
| 2012 | 2 ha | 20 ha | 21 ha |
| 2013 | 1 ha | 21 ha | 22 ha |
| 2014 | 72 ha | 33 ha | 104 ha |
| 2015 | 2 ha | 45 ha | 47 ha |
| 2016 | 32 ha | 60 ha | 92 ha |
| 2017 | 47 ha | 105 ha | 152 ha |
| 2018 | 8 ha | 38 ha | 46 ha |
| 2019 | 4 ha | 36 ha | 40 ha |
| 2020 | 6 ha | 56 ha | 62 ha |
| 2021 | 4 ha | 49 ha | 53 ha |
| 2022 | 4 ha | 27 ha | 31 ha |
| 2023 | 5 ha | 38 ha | 43 ha |
| 2024 | 1 ha | 41 ha | 43 ha |
| 2025 | 4 ha | 89 ha | 93 ha |
What is causing deforestation around Olsztyn?
- Loggingcan grow back78% · 1,020 ha
- Towns and roadscleared for good20% · 263 ha
Also: mining and energy, farms, pasture and plantations, 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
- 11,100 ha
- Forest in 2020
- 11,600 ha
- Overall change
- +425 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Olsztyn grew from about 11,100 hectares to 11,600 hectares, a net gain of about 425 hectares (+3.8%). New forest grew on about 850 hectares, while 425 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
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Frequently asked
Questions about Olsztyn
What is the air quality (AQI) in Olsztyn right now?
The latest reading for Olsztyn shows an AQI of 61 (Moderate), measured Nov 11, 16:00 local time by the Olsztyn, ul. Puszkina ground monitoring station, 700 m 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 Olsztyn today?
At AQI 61 (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 Olsztyn been like this week?
Over the last 7 days, the CAMS air-quality model put Olsztyn's daily AQI at 74 on average, from 42 on Nov 6 to an hourly peak of 139 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Olsztyn lost since 2001?
Since 2001, the area within 10 km of Olsztyn has lost about 1,310 hectares of forest (about 1,800 football pitches): 11% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 280 hectares (21%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 52 hectares a year in 2021–2025, down from 78 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Olsztyn grew from about 11,100 hectares to 11,600 hectares, a net gain of about 425 hectares (+3.8%). New forest grew on about 850 hectares, while 425 hectares were lost.
What is the tree count in Olsztyn?
Olsztyn has an estimated 123,027 trees across the 12.56 km² of land measured — 39.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Olsztyn need?
Olsztyn has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Olsztyn's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Osiedle Kętrzyńskiego, 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 Osiedle Kętrzyńskiego; the tree count is an estimate derived from that cover.
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