City report · Emilia-Romagna, Italy
Bologna Air quality today
Air quality in Bologna currently reads AQI 165 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
AQI 165
Air quality right now
Unhealthy
- PM2.5, fine particles (µg/m³)
- 82.2
- tree cover
- 33.2%
- trees in this area
- 104K
- more trees needed
- 21.4K
Measured across a 2 km radius around Old Town, Bologna, Metropolitan City of Bologna, Italy (12.57 km²), from a satellite image of Sep 26, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Bologna · AQI 165 (Unhealthy)
Bologna's tree count comes to 104,301 trees across 12.57 km², 7 points below the 40% tree-cover level considered healthy for this area, so roughly 21,363 more trees would close the gap.
Air quality detail
Air quality in Bologna today: AQI 165, Unhealthy
Main pollutant: PM2.5 · Observed Nov 11, 09:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 65 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 65 km, e.g. Modena and Reggio Emilia
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
82.2
PM10
37.6
NO₂
30.5
O₃
9.0
SO₂
1.9
CO
341.0
- Outdoor exercise
- Everyone should cut down long or hard exercise; sensitive groups should avoid it
- Windows
- Keep them closed
- Mask
- Wear an N95 outdoors
- Air purifier
- Run one
Over the last 7 days, the CAMS air-quality model put Bologna's daily AQI at 83 on average, from 68 on Nov 5 to an hourly peak of 129 on Nov 9.
Where Bologna stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Bologna: Below target
33.2% tree cover against a 40% healthy-neighborhood target, across 12.57 km².
Trees in this area
104,301
Target trees
125,664
More trees needed
21,363
CO₂ if planted / yr
470.0 t
Deforestation · 2001–2025
How much forest has Bologna lost?
Since 2001, the area within 10 km of Bologna has lost about 47 hectares of forest (about 66 football pitches): 1.4% of the forest it had in 2000. The biggest cause was logging (33%), after which forest can grow back. About 20 hectares (43%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 47 haabout 66 football pitches
- Share of its forest
- 1.4%of what there was in 2000
- Cleared for good
- 20 hadeforestation: turned into farms, mines or towns
The worst year was 2014, when about 6 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 | 1 ha | 1 ha |
| 2002 | under 1 ha | under 1 ha | 1 ha |
| 2003 | 1 ha | under 1 ha | 1 ha |
| 2004 | under 1 ha | under 1 ha | 2 ha |
| 2005 | 1 ha | 2 ha | 3 ha |
| 2006 | under 1 ha | under 1 ha | 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | 1 ha | 1 ha | 2 ha |
| 2014 | 3 ha | 2 ha | 6 ha |
| 2015 | under 1 ha | 1 ha | 2 ha |
| 2016 | 2 ha | under 1 ha | 2 ha |
| 2017 | under 1 ha | under 1 ha | 1 ha |
| 2018 | 2 ha | 2 ha | 4 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | 2 ha | 2 ha | 4 ha |
| 2021 | under 1 ha | under 1 ha | 2 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | 2 ha | 2 ha | 4 ha |
| 2024 | under 1 ha | 2 ha | 2 ha |
| 2025 | under 1 ha | 5 ha | 6 ha |
What is causing deforestation around Bologna?
- Loggingcan grow back33% · 15 ha
- Towns and roadscleared for good30% · 14 ha
- Farms, pasture and plantationscleared for good12% · 6 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
- 5,610 ha
- Forest in 2020
- 5,880 ha
- Overall change
- +269 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Bologna grew from about 5,610 hectares to 5,880 hectares, a net gain of about 269 hectares (+4.8%). New forest grew on about 306 hectares, while 37 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 Bologna
What is the air quality (AQI) in Bologna right now?
The latest reading for Bologna shows an AQI of 165 (Unhealthy), observed Nov 11, 09:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 65 km, US EPA index. The main pollutant is PM2.5. Everyone should limit long outdoor exertion; sensitive groups more so.
Is it safe to exercise outside in Bologna today?
At AQI 165 (Unhealthy): everyone should cut down long or hard exercise; sensitive groups should avoid it. Windows: keep them closed. Masks: wear an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Bologna been like this week?
Over the last 7 days, the CAMS air-quality model put Bologna's daily AQI at 83 on average, from 68 on Nov 5 to an hourly peak of 129 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 Bologna lost since 2001?
Since 2001, the area within 10 km of Bologna has lost about 47 hectares of forest (about 66 football pitches): 1.4% of the forest it had in 2000. The biggest cause was logging (33%), after which forest can grow back. About 20 hectares (43%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Bologna grew from about 5,610 hectares to 5,880 hectares, a net gain of about 269 hectares (+4.8%). New forest grew on about 306 hectares, while 37 hectares were lost.
What is the tree count in Bologna?
Bologna has an estimated 104,301 trees across the 12.57 km² measured — 33.2% tree cover, 7 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Bologna need?
Bologna needs roughly 21,363 more trees to close a 7-point shortfall against its 40% tree-cover target — about 470.0 t of extra CO₂ absorbed per year once grown.
How are Bologna's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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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