Air quality comparison · Poland, 145 km apart
Poznań vs Wrocław Air quality index (AQI) today
Poznań has cleaner air than Wrocław right now: AQI 77 (Moderate) against 140 (Unhealthy for sensitive groups).
That puts them in different EPA bands, so the health advice differs today. Over the past 6 days, on modeled daily averages, Poznań averaged AQI 97 against 106, and it was the cleaner of the two on 4 of those days. Poznań has lost more forest since 2001. Poznań has more tree cover.
Poland
AQI 77
Moderate
Cleaner right now
- PM2.5
- 23.3 µg/m³1.6× WHO guideline
- Main pollutant
- PM2.5
- Source
- Ground station
- Reading
- Nov 11, 17:00 local
Poland
AQI 140
Unhealthy for sensitive groups
Cleaner right now
- PM2.5
- 51.4 µg/m³3.4× WHO guideline
- Main pollutant
- PM2.5
- Source
- Ground station
- Reading
- Nov 11, 18:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Poznań77Wrocław140
Head to head
Poznań vs Wrocław at a glance
Poznań is ahead on 5 of 6 measures, and Wrocław on 1. The better figure in each row is marked.
| Poznań | Wrocław | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 77 (better) | 140 |
| PM2.5Fine particles, µg/m³. | 23.3 (better) | 51.4 |
| Past week's averageUS AQI, 6 days. | 97 (better) | 106 |
| Forest lost since 2001Within 10 km of the center. | 495 ha | 146 ha (better) |
| Tree coverWithin 2 km of the center. | 34.5% (better) | 29.8% |
| Trees still neededTo reach a healthy canopy. | 0 (better) | 16.1K |
Air quality today
What is the air like in Poznań and Wrocław right now?
Poznań has cleaner air than Wrocław right now: AQI 77 (Moderate) against 140 (Unhealthy for sensitive groups). PM2.5 is setting the index in both.
Poznań's PM2.5 is about 1.6× the WHO's 24-hour guideline of 15 µg/m³. Wrocław's PM2.5 is about 3.4× the WHO's 24-hour guideline of 15 µg/m³.
Both readings come from nearby ground stations.
PoznańWrocław
Concentrations at the same moment as the index above, for the pollutants both places report. Lower is better. The dark marks on the PM2.5 and PM10 rows show the WHO's 24-hour guidelines (15 and 45 µg/m³).
The past week
Which had cleaner air over the past 6 days?
Over the past 6 days, on modeled daily averages, Poznań averaged AQI 97 against 106, and it was the cleaner of the two on 4 of those days. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Poznań4Wrocław2
- Average AQI
- Poznań97Wrocław106
- Worst day, AQI
- Poznań148Wrocław122
The daily numbers (6 days)
| Day | Poznań | Wrocław |
|---|---|---|
| Nov 4 | 56 | 67 |
| Nov 5 | 98 | 103 |
| Nov 6 | 71 | 117 |
| Nov 7 | 84 | 118 |
| Nov 8 | 124 | 122 |
| Nov 9 | 148 | 108 |
Daily averages from the CAMS atmospheric model for both places, so the week compares like with like. They can differ from today's reading at the top of the page wherever that comes from a ground station.
What it means today
Is it safe to go outside in Poznań and Wrocław today?
Poznań (AQI 77, Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Wrocław (AQI 140, Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
Exercise outdoors
- Poznań
- Fine for most people; unusually sensitive people should take long or hard exercise easier.
- Wrocław
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise.
Windows
- Poznań
- Fine to open; close them if you are sensitive to pollution.
- Wrocław
- Close them to keep the outside air out.
Masks
- Poznań
- Not needed for most people.
- Wrocław
- Sensitive groups: an N95 outdoors.
Air purifier
- Poznań
- Worth running if you are sensitive.
- Wrocław
- Run one, especially in bedrooms.
Against everywhere else
How do Poznań and Wrocław compare with the rest of the world?
Right now Poznań's air is cleaner than 32% of the 5,420 places Airleaf tracks, and Wrocław's is cleaner than 12%. Within Poland, that is 53% and 18% of its 39 measured places.
Cleaner air than…
- Poznań
- Beats 32%
- Wrocław
- Beats 12%
More tree cover than…
- Poznań
- Beats 76%
- Wrocław
- Beats 68%
Includes model estimates as well as station readings, so it can differ from our most polluted and cleanest air rankings, which use station readings only.
Deforestation · 2001–2025
Which has lost more forest, Poznań or Wrocław?
Poznań has lost more: about 495 ha of forest within 10 km of its center from 2001 to 2025, against 146 ha around Wrocław. 107 ha of that was cleared for good, for farms, mines or towns.
Measured within 10 km of each center, from the yearly satellite maps of forest loss: a wider circle than the one for tree cover, because forest is usually lost at a city's edges.
Worst year: 2020, with 41 ha lost.
Worst year: 2001, with 22 ha lost.
| Poznań | Wrocław | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 495 ha | 146 ha (better) |
| Share of its forestOf what it had in 2000. | 7% | 2.4% (better) |
| Cleared for goodTurned into farms, mines or towns. | 107 ha (better) | 115 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Logging (74%) | Towns and roads (69%) |
Satellite timelapses
Watch both change, year by year
A clear satellite photo a year of the land around each city. Press play, turn on the forest cleared since the first year, or drag the before and after.
Poznań
2018: satellite photo from August 2018 of a 5 × 5 km area about 6 km east of the city center.
Wrocław
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Poznań or Wrocław?
Poznań has more tree cover: 34.5% of the land within 2 km of its center against 29.8% around Wrocław, or about 107,843 trees against 92,122.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Poznań | Wrocław | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 108K (better) | 92.1K |
| Trees still neededTo reach the target. Fewer is better. | 0 (better) | 16.1K |
| CO₂ absorbed each yearBy the trees already standing. | 2.4M kg (better) | 2.0M kg |
Tree cover on the satellite image
The same 2 km radius around each center, with the tree cover the satellite found marked on it.
Reading these numbers
How this comparison is made
Air quality index
The US EPA index, computed from current pollutant concentrations: ground stations where a place has them nearby, and the CAMS atmospheric model everywhere else. It moves hour to hour, so it is a snapshot rather than a verdict on either place. The guideline marks are from the WHO's 2021 air quality guidelines.
Trees and forest
Tree cover is the share of ground under canopy within 2 km of each center, read from Sentinel-2 satellite imagery at 10 m detail. It measures that circle, not the whole municipality, which is what makes the two comparable. Forest loss comes from the University of Maryland's Global Forest Change maps.
More on the method on the About Airleaf page.
Frequently asked
Poznań vs Wrocław: your questions answered
Is Poznań cleaner than Wrocław?
On air quality, yes, right now: Poznań reads AQI 77 against 140, a gap of 63 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. Over the past 6 days, on modeled daily averages, Poznań averaged AQI 97 against 106, and it was the cleaner of the two on 4 of those days.
Is it safe to exercise outdoors in Poznań and Wrocław today?
In Poznań, at AQI 77: Unusually sensitive people should consider limiting long outdoor exertion. In Wrocław, at AQI 140: Sensitive groups should limit long or intense outdoor activity.
Which has lost more forest, Poznań or Wrocław?
Poznań has lost more: about 495 ha of forest within 10 km of its center from 2001 to 2025, against 146 ha around Wrocław. 107 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Poznań or Wrocław?
Poznań has more tree cover: 34.5% of the land within 2 km of its center against 29.8% around Wrocław, or about 107,843 trees against 92,122. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Poznań and Wrocław need?
Poznań needs about 0 more to reach its canopy target of 30%, and Wrocław about 16,075 to reach 35%. The target starts at 30% of the land and rises where air quality is poor.
Are Poznań and Wrocław measured the same way?
The method is the same: the US EPA index for air, and Sentinel-2 satellite imagery at 10 m detail over an identical radius for trees. Both readings come from nearby ground stations. Nothing is adjusted for population, city limits or climate.
How often does the Poznań vs Wrocław comparison update?
The air readings refresh about once an hour, and each reading's local time is shown at the top of the page. Tree cover comes from the latest clear satellite image of each area (Aug 27, 2026 and Sep 8, 2026), and the forest figures are published yearly.
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