City report · Boyacá, Colombia
Tunja Air quality today
Air quality in Tunja currently reads AQI 21 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 21
Good
- PM2.5, fine particles (µg/m³)
- 3.5
- tree cover
- 19.3%
- trees in this area
- 60.6K
- more trees needed
- 33.6K
Measured across a 2 km radius around Tunja, Boyaca, Colombia (12.57 km²), from a satellite image of Aug 10, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Tunja · AQI 21 (Good)
Tunja's tree count comes to 60,633 trees across 12.57 km², 11 points below the 30% tree-cover level considered healthy for this area, so roughly 33,615 more trees would close the gap.
Air quality detail
Air quality in Tunja today: AQI 21, Good
Main pollutant: PM2.5 · Observed Nov 10, 14:00 local time via Open-Meteo / CAMS, corrected with 6 ground-station cities within 245 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 6 station cities within 245 km, e.g. Zipaquirá and Chía
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.5
PM10
4.0
NO₂
0.3
O₃
76.0
SO₂
0.8
CO
127.0
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Tunja's daily AQI at 23 on average, from 15 on Nov 7 to an hourly peak of 52 on Nov 4.
Where Tunja stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Tunja: Below target
19.3% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
60,633
Target trees
94,248
More trees needed
33,615
CO₂ if planted / yr
739.5 t
Deforestation · 2001–2025
How much forest has Tunja lost?
Since 2001, the area within 10 km of Tunja has lost about 109 hectares of forest (about 150 football pitches): 6.6% of the forest it had in 2000. Most of it (72%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from February 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 109 haabout 150 football pitches
- Share of its forest
- 6.6%of what there was in 2000
- Cleared for good
- 78 hadeforestation: turned into farms, mines or towns
The worst year was 2009, when about 17 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 | 7 ha | 2 ha | 9 ha |
| 2002 | 1 ha | under 1 ha | 2 ha |
| 2003 | 4 ha | under 1 ha | 4 ha |
| 2004 | 4 ha | under 1 ha | 4 ha |
| 2005 | 11 ha | 1 ha | 12 ha |
| 2006 | 5 ha | under 1 ha | 6 ha |
| 2007 | 12 ha | 3 ha | 16 ha |
| 2008 | 3 ha | 3 ha | 6 ha |
| 2009 | 6 ha | 11 ha | 17 ha |
| 2010 | 4 ha | 3 ha | 6 ha |
| 2011 | 4 ha | 1 ha | 5 ha |
| 2012 | 9 ha | 3 ha | 12 ha |
| 2013 | under 1 ha | under 1 ha | 2 ha |
| 2014 | under 1 ha | under 1 ha | 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | 3 ha | under 1 ha | 3 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | 2 ha | under 1 ha | 2 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Tunja?
- Farms, pasture and plantationscleared for good72% · 78 ha
- Loggingcan grow back15% · 17 ha
- Unknown causescause unknown13% · 14 ha
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
- 2,090 ha
- Forest in 2020
- 2,320 ha
- Overall change
- +229 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Tunja grew from about 2,090 hectares to 2,320 hectares, a net gain of about 229 hectares (+11%). New forest grew on about 268 hectares, while 38 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 Tunja
What is the air quality (AQI) in Tunja right now?
The latest reading for Tunja shows an AQI of 21 (Good), observed Nov 10, 14:00 local time via Open-Meteo / CAMS, corrected with 6 ground-station cities within 245 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Tunja today?
At AQI 21 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Tunja been like this week?
Over the last 7 days, the CAMS air-quality model put Tunja's daily AQI at 23 on average, from 15 on Nov 7 to an hourly peak of 52 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Tunja lost since 2001?
Since 2001, the area within 10 km of Tunja has lost about 109 hectares of forest (about 150 football pitches): 6.6% of the forest it had in 2000. Most of it (72%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Tunja grew from about 2,090 hectares to 2,320 hectares, a net gain of about 229 hectares (+11%). New forest grew on about 268 hectares, while 38 hectares were lost.
What is the tree count in Tunja?
Tunja has an estimated 60,633 trees across the 12.57 km² measured — 19.3% tree cover, 11 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Tunja need?
Tunja needs roughly 33,615 more trees to close a 11-point shortfall against its 30% tree-cover target — about 739.5 t of extra CO₂ absorbed per year once grown.
How are Tunja'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 Tunja; the tree count is an estimate derived from that cover.
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