City report · Turkey
Bolu Air quality today
Air quality in Bolu currently reads AQI 148 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
Air quality right now
AQI 148
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 54.6
- tree cover
- 8.4%
- trees in this area
- 26.4K
- more trees needed
- 83.6K
Measured across a 2 km radius around Bolu, Bolu Merkez/Bolu, Türkiye (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Bolu · AQI 148 (Unhealthy for sensitive groups)
Bolu's tree count comes to 26,389 trees across 12.57 km², 27 points below the 35% tree-cover level considered healthy for this area, so roughly 83,566 more trees would close the gap.
Air quality detail
Air quality in Bolu today: AQI 148, Unhealthy for sensitive groups
Main pollutant: PM2.5 · Observed Nov 11, 17:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Trafik, Turkey, 700 m away
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
54.6
PM10
67.1
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Turkey National Air Quality Monitoring Network (Ulusal Hava Kalitesi İzleme Ağı)
- Outdoor exercise
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise
- Windows
- Close them to keep the outside air out
- Mask
- Sensitive groups: an N95 outdoors
- Air purifier
- Run one, especially in bedrooms
Over the last 7 days, the CAMS air-quality model put Bolu's daily AQI at 47 on average, from 39 on Nov 8 to an hourly peak of 71 on Nov 8.
Where Bolu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Bolu: Critically low
8.4% tree cover against a 35% healthy-neighborhood target, across 12.57 km².
Trees in this area
26,389
Target trees
109,955
More trees needed
83,566
CO₂ if planted / yr
1,838 t
Deforestation · 2001–2025
How much forest has Bolu lost?
Since 2001, the area within 10 km of Bolu has lost about 419 hectares of forest (about 590 football pitches): 3.7% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 110 hectares (26%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area about 7 km northwest of the city center.
- Forest lost since 2001
- 419 haabout 590 football pitches
- Share of its forest
- 3.7%of what there was in 2000
- Cleared for good
- 110 hadeforestation: turned into farms, mines or towns
The worst year was 2020, when about 59 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 | 1 ha | 9 ha | 10 ha |
| 2003 | 3 ha | 7 ha | 10 ha |
| 2004 | under 1 ha | under 1 ha | 2 ha |
| 2005 | 2 ha | 1 ha | 3 ha |
| 2006 | under 1 ha | 3 ha | 3 ha |
| 2007 | 1 ha | 5 ha | 6 ha |
| 2008 | 9 ha | 3 ha | 12 ha |
| 2009 | under 1 ha | 6 ha | 6 ha |
| 2010 | 2 ha | 12 ha | 14 ha |
| 2011 | 10 ha | 12 ha | 23 ha |
| 2012 | under 1 ha | 1 ha | 1 ha |
| 2013 | 4 ha | 3 ha | 7 ha |
| 2014 | 4 ha | 6 ha | 9 ha |
| 2015 | under 1 ha | 20 ha | 21 ha |
| 2016 | 7 ha | 17 ha | 24 ha |
| 2017 | 14 ha | 32 ha | 46 ha |
| 2018 | 17 ha | 25 ha | 41 ha |
| 2019 | 4 ha | 20 ha | 24 ha |
| 2020 | 7 ha | 53 ha | 59 ha |
| 2021 | 3 ha | 15 ha | 18 ha |
| 2022 | under 1 ha | 12 ha | 13 ha |
| 2023 | 7 ha | 17 ha | 24 ha |
| 2024 | 4 ha | 13 ha | 17 ha |
| 2025 | 9 ha | 18 ha | 27 ha |
What is causing deforestation around Bolu?
- Loggingcan grow back67% · 282 ha
- Towns and roadscleared for good16% · 68 ha
- Mining and energycleared for good8% · 34 ha
Also: storms, floods and other natural causes, 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
- 11,900 ha
- Forest in 2020
- 11,900 ha
- Overall change
- +7 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Bolu stayed about the same size, at about 11,900 hectares: new forest grew on about 129 hectares, and about 122 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 Bolu
What is the air quality (AQI) in Bolu right now?
The latest reading for Bolu shows an AQI of 148 (Unhealthy for sensitive groups), measured Nov 11, 17:00 local time by the Trafik, Turkey ground monitoring station, 700 m away, via OpenAQ. The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Bolu today?
At AQI 148 (Unhealthy for sensitive groups): children, older adults and people with asthma or heart disease should cut down long or hard exercise. Windows: close them to keep the outside air out. Masks: sensitive groups: an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Bolu been like this week?
Over the last 7 days, the CAMS air-quality model put Bolu's daily AQI at 47 on average, from 39 on Nov 8 to an hourly peak of 71 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 Bolu lost since 2001?
Since 2001, the area within 10 km of Bolu has lost about 419 hectares of forest (about 590 football pitches): 3.7% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 110 hectares (26%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Bolu stayed about the same size, at about 11,900 hectares: new forest grew on about 129 hectares, and about 122 hectares were lost.
What is the tree count in Bolu?
Bolu has an estimated 26,389 trees across the 12.57 km² measured — 8.4% tree cover, 27 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Bolu need?
Bolu needs roughly 83,566 more trees to close a 27-point shortfall against its 35% tree-cover target — about 1,838 t of extra CO₂ absorbed per year once grown.
How are Bolu's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Bolu, 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 Bolu; the tree count is an estimate derived from that cover.
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