City report · Kocaeli, Turkey
Derince Air quality today
Air quality in Derince currently reads AQI 92 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 92
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 30.9
- tree cover
- 14.7%
- trees in this area
- 36.7K
- more trees needed
- 38.2K
Measured across a 2 km radius around Derince, Kocaeli, Türkiye (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Derince · AQI 92 (Moderate)
Derince's tree count comes to 36,714 trees across 9.99 km² of land, 15 points below the 30% tree-cover level considered healthy for this area, so roughly 38,213 more trees would close the gap.
Air quality detail
Air quality in Derince today: AQI 92, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 19:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Kocaeli Golcuk, Turkey, 3.8 km away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
30.9
PM10
43.2
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Turkey National Air Quality Monitoring Network (Ulusal Hava Kalitesi İzleme Ağı)
- 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 Derince's daily AQI at 57 on average, from 44 on Nov 5 to an hourly peak of 127 on Nov 9.
Where Derince stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Derince: Critically low
14.7% tree cover against a 30% healthy-neighborhood target, across 9.99 km² of land.
Trees in this area
36,714
Target trees
74,927
More trees needed
38,213
CO₂ if planted / yr
840.7 t
Deforestation · 2001–2025
How much forest has Derince lost?
Since 2001, the area within 10 km of Derince has lost about 2,740 hectares of forest (about 3,800 football pitches): 27% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 125 hectares (4.6%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area about 5 km north of the city center.
- Forest lost since 2001
- 2,740 haabout 3,800 football pitches
- Share of its forest
- 27%of what there was in 2000
- Cleared for good
- 125 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 42 hectares a year in 2021–2025, down from 60 hectares a year in 2016–2020. The worst year was 2008, when about 355 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 | 11 ha | 9 ha | 20 ha |
| 2002 | under 1 ha | 7 ha | 8 ha |
| 2003 | 2 ha | 8 ha | 9 ha |
| 2004 | 8 ha | 110 ha | 118 ha |
| 2005 | 7 ha | 59 ha | 67 ha |
| 2006 | 11 ha | 126 ha | 137 ha |
| 2007 | 6 ha | 130 ha | 136 ha |
| 2008 | 10 ha | 345 ha | 355 ha |
| 2009 | 7 ha | 197 ha | 204 ha |
| 2010 | 4 ha | 278 ha | 282 ha |
| 2011 | 2 ha | 122 ha | 124 ha |
| 2012 | 4 ha | 254 ha | 258 ha |
| 2013 | 2 ha | 104 ha | 106 ha |
| 2014 | 3 ha | 250 ha | 253 ha |
| 2015 | 4 ha | 150 ha | 154 ha |
| 2016 | 4 ha | 53 ha | 56 ha |
| 2017 | 8 ha | 10 ha | 18 ha |
| 2018 | 4 ha | 80 ha | 84 ha |
| 2019 | 6 ha | 43 ha | 49 ha |
| 2020 | 3 ha | 91 ha | 94 ha |
| 2021 | 4 ha | 53 ha | 57 ha |
| 2022 | 3 ha | 61 ha | 63 ha |
| 2023 | 6 ha | 34 ha | 40 ha |
| 2024 | 2 ha | 12 ha | 14 ha |
| 2025 | 6 ha | 28 ha | 34 ha |
What is causing deforestation around Derince?
- Loggingcan grow back91% · 2,480 ha
- Wildfirescan grow back4.5% · 122 ha
- Towns and roadscleared for good2.2% · 60 ha
Also: farms, pasture and plantations, mining and energy, 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
- 10,500 ha
- Overall change
- −547 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Derince shrank from about 11,100 hectares to 10,500 hectares, a net loss of about 547 hectares (−4.9%). New forest grew on about 65 hectares, but 612 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 Derince
What is the air quality (AQI) in Derince right now?
The latest reading for Derince shows an AQI of 92 (Moderate), measured Nov 11, 19:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Kocaeli Golcuk, Turkey, 3.8 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Derince today?
At AQI 92 (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 Derince been like this week?
Over the last 7 days, the CAMS air-quality model put Derince's daily AQI at 57 on average, from 44 on Nov 5 to an hourly peak of 127 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 Derince lost since 2001?
Since 2001, the area within 10 km of Derince has lost about 2,740 hectares of forest (about 3,800 football pitches): 27% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 125 hectares (4.6%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 42 hectares a year in 2021–2025, down from 60 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Derince shrank from about 11,100 hectares to 10,500 hectares, a net loss of about 547 hectares (−4.9%). New forest grew on about 65 hectares, but 612 hectares were lost.
What is the tree count in Derince?
Derince has an estimated 36,714 trees across the 9.99 km² of land measured — 14.7% tree cover, 15 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Derince need?
Derince needs roughly 38,213 more trees to close a 15-point shortfall against its 30% tree-cover target — about 840.7 t of extra CO₂ absorbed per year once grown.
How are Derince's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Derince, 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 Derince; the tree count is an estimate derived from that cover.
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