City report · Fukushima, Japan
Kōriyama Air quality today
Air quality in Kōriyama currently reads AQI 44 (Good): Air quality is satisfactory for everyone.
AQI 44
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 8.0
- tree cover
- 5.5%
- trees in this area
- 17.2K
- more trees needed
- 76.6K
Measured across a 2 km radius around 2 Chome-13 Shimizudai, Koriyama, Fukushima 963-8005, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Kōriyama · AQI 44 (Good)
Kōriyama's tree count comes to 17,192 trees across 12.51 km² of land, 25 points below the 30% tree-cover level considered healthy for this area, so roughly 76,584 more trees would close the gap.
Air quality detail
Air quality in Kōriyama today: AQI 44, Good
Main pollutant: PM2.5 · Observed Nov 12, 02:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · 郡山市台新１－８０４, 3.7 km away · median of 3 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
8.0
PM10
—
NO₂
16.9
O₃
—
SO₂
0.0
CO
—
Data: OpenAQ · Ministry of the Environment Air Pollutant Wide Area Monitoring System
- 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 Kōriyama's daily AQI at 24 on average, from 7 on Nov 7 to an hourly peak of 59 on Nov 5.
Where Kōriyama stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Kōriyama: Critically low
5.5% tree cover against a 30% healthy-neighborhood target, across 12.51 km² of land.
Trees in this area
17,192
Target trees
93,776
More trees needed
76,584
CO₂ if planted / yr
1,685 t
Deforestation · 2001–2025
How much forest has Kōriyama lost?
Since 2001, the area within 10 km of Kōriyama has lost about 275 hectares of forest (about 390 football pitches): 4.6% of the forest it had in 2000. The biggest cause was logging (48%), after which forest can grow back. About 131 hectares (48%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 275 haabout 390 football pitches
- Share of its forest
- 4.6%of what there was in 2000
- Cleared for good
- 131 hadeforestation: turned into farms, mines or towns
The worst year was 2012, when about 34 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 | 12 ha | 9 ha | 21 ha |
| 2002 | 5 ha | 9 ha | 13 ha |
| 2003 | 2 ha | 3 ha | 6 ha |
| 2004 | 5 ha | 7 ha | 12 ha |
| 2005 | under 1 ha | 3 ha | 4 ha |
| 2006 | 10 ha | 13 ha | 23 ha |
| 2007 | 9 ha | 14 ha | 23 ha |
| 2008 | 3 ha | 18 ha | 21 ha |
| 2009 | 9 ha | 7 ha | 15 ha |
| 2010 | 2 ha | 5 ha | 7 ha |
| 2011 | under 1 ha | under 1 ha | 1 ha |
| 2012 | 20 ha | 14 ha | 34 ha |
| 2013 | 1 ha | under 1 ha | 2 ha |
| 2014 | 2 ha | 2 ha | 4 ha |
| 2015 | 26 ha | 5 ha | 30 ha |
| 2016 | 3 ha | 2 ha | 4 ha |
| 2017 | 4 ha | 1 ha | 5 ha |
| 2018 | under 1 ha | 2 ha | 3 ha |
| 2019 | 2 ha | 2 ha | 4 ha |
| 2020 | 2 ha | 2 ha | 3 ha |
| 2021 | 3 ha | 5 ha | 8 ha |
| 2022 | 5 ha | 2 ha | 6 ha |
| 2023 | 3 ha | 10 ha | 13 ha |
| 2024 | 1 ha | 11 ha | 12 ha |
| 2025 | 1 ha | under 1 ha | 2 ha |
What is causing deforestation around Kōriyama?
- Loggingcan grow back48% · 132 ha
- Towns and roadscleared for good45% · 123 ha
- Farms, pasture and plantationscleared for good2.8% · 8 ha
Also: 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
- 6,710 ha
- Forest in 2020
- 6,800 ha
- Overall change
- +89 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Kōriyama stayed about the same size, at about 6,800 hectares: new forest grew on about 237 hectares, and about 148 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 Kōriyama
Same 2 km radius, same index — so they compare directly.
- Aizu-Wakamatsu40.0 km
Japan
- Tree cover
- 45%
- Air quality
- 22
- Nasushiobara54.8 km
Japan
- Tree cover
- 44%
- Air quality
- 5
- Iwaki58.9 km
Japan
- Tree cover
- 31%
- Air quality
- 33
- Hitachi92.1 km
Japan
- Tree cover
- 35%
- Air quality
- 17
- Yamagata92.7 km
Japan
- Tree cover
- 67%
- Air quality
- 33
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Frequently asked
Questions about Kōriyama
What is the air quality (AQI) in Kōriyama right now?
The latest reading for Kōriyama shows an AQI of 44 (Good), measured Nov 12, 02:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 郡山市台新１－８０４, 3.7 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Kōriyama today?
At AQI 44 (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 Kōriyama been like this week?
Over the last 7 days, the CAMS air-quality model put Kōriyama's daily AQI at 24 on average, from 7 on Nov 7 to an hourly peak of 59 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Kōriyama lost since 2001?
Since 2001, the area within 10 km of Kōriyama has lost about 275 hectares of forest (about 390 football pitches): 4.6% of the forest it had in 2000. The biggest cause was logging (48%), after which forest can grow back. About 131 hectares (48%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Kōriyama stayed about the same size, at about 6,800 hectares: new forest grew on about 237 hectares, and about 148 hectares were lost.
What is the tree count in Kōriyama?
Kōriyama has an estimated 17,192 trees across the 12.51 km² of land measured — 5.5% tree cover, 25 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Kōriyama need?
Kōriyama needs roughly 76,584 more trees to close a 25-point shortfall against its 30% tree-cover target — about 1,685 t of extra CO₂ absorbed per year once grown.
How are Kōriyama's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 2 Chome-13 Shimizudai, 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 2 Chome-13 Shimizudai; the tree count is an estimate derived from that cover.
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