City report · Taiwan
Tainan Air quality today
Air quality in Tainan currently reads AQI 71 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 71
Moderate
- PM2.5, fine particles (µg/m³)
- 20.0
- tree cover
- 12.3%
- trees in this area
- 38.6K
- more trees needed
- 55.6K
Measured across a 2 km radius around Tainan, Daxue Village, East District, Tainan City, Taiwan (12.57 km²), from a satellite image of Sep 18, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Tainan · AQI 71 (Moderate)
Tainan's tree count comes to 38,642 trees across 12.57 km², 18 points below the 30% tree-cover level considered healthy for this area, so roughly 55,606 more trees would close the gap.
Air quality detail
Air quality in Tainan today: AQI 71, Moderate
Main pollutant: PM2.5 · Observed Nov 12, 00:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 臺南市 - 林森, 1.1 km away · median of 3 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
20.0
PM10
56.0
NO₂
35.8
O₃
53.0
SO₂
4.1
CO
504.1
Data: OpenAQ · Taiwan, Ministry of Environment, Taiwan (Open Government Data License 1.0)
- 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 Tainan's daily AQI at 103 on average, from 70 on Nov 10 to an hourly peak of 159 on Nov 7.
Where Tainan stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Tainan: Critically low
12.3% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
38,642
Target trees
94,248
More trees needed
55,606
CO₂ if planted / yr
1,223 t
Deforestation · 2001–2025
How much forest has Tainan lost?
Since 2001, the area within 10 km of Tainan has lost about 11 hectares of forest (about 16 football pitches): 2.8% of the forest it had in 2000. The biggest cause was towns and roads (28%). About 3 hectares (29%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from February 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 11 haabout 16 football pitches
- Share of its forest
- 2.8%of what there was in 2000
- Cleared for good
- 3 hadeforestation: turned into farms, mines or towns
The worst year was 2006, when about 2 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 | 2 ha |
| 2002 | under 1 ha | 1 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | 1 ha | 2 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 | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 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 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Tainan?
- Towns and roadscleared for good28% · 3 ha
- Unknown causescause unknown71% · 8 ha
Also: farms, pasture and plantations.
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
- 396 ha
- Forest in 2020
- 665 ha
- Overall change
- +269 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Tainan grew from about 396 hectares to 665 hectares, a net gain of about 269 hectares (+68%). New forest grew on about 282 hectares, while 13 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
In the same region
Measured cities near Tainan
Same 2 km radius, same index — so they compare directly.
- Chiayi City59.4 km
Taiwan
- Tree cover
- 15%
- Air quality
- 73
- Douliu86.7 km
Taiwan
- Tree cover
- 30%
- Air quality
- 64
- Taitung98.8 km
Taiwan
- Tree cover
- 32%
- Air quality
- 51
- Nantou112.6 km
Taiwan
- Tree cover
- 55%
- Air quality
- 60
- Yuanlin113.6 km
Taiwan
- Tree cover
- 18%
- Air quality
- 58
Also compared:Tainan vs TaipeiTainan vs Taichung
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Frequently asked
Questions about Tainan
What is the air quality (AQI) in Tainan right now?
The latest reading for Tainan shows an AQI of 71 (Moderate), measured Nov 12, 00:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 臺南市 - 林森, 1.1 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Tainan today?
At AQI 71 (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 Tainan been like this week?
Over the last 7 days, the CAMS air-quality model put Tainan's daily AQI at 103 on average, from 70 on Nov 10 to an hourly peak of 159 on Nov 7. On 3 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Tainan lost since 2001?
Since 2001, the area within 10 km of Tainan has lost about 11 hectares of forest (about 16 football pitches): 2.8% of the forest it had in 2000. The biggest cause was towns and roads (28%). About 3 hectares (29%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Tainan grew from about 396 hectares to 665 hectares, a net gain of about 269 hectares (+68%). New forest grew on about 282 hectares, while 13 hectares were lost.
What is the tree count in Tainan?
Tainan has an estimated 38,642 trees across the 12.57 km² measured — 12.3% tree cover, 18 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Tainan need?
Tainan needs roughly 55,606 more trees to close a 18-point shortfall against its 30% tree-cover target — about 1,223 t of extra CO₂ absorbed per year once grown.
How are Tainan's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Tainan, 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 Tainan; the tree count is an estimate derived from that cover.
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