City report · Yamagata, Japan
Yamagata Air quality today
Air quality in Yamagata 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
- 66.9%
- trees in this area
- 210K
- more trees needed
- 0
Measured across a 2 km radius around Hirashimizu, Yamagata, Japan (12.57 km²), from a satellite image of Sep 23, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Yamagata · AQI 44 (Good)
Yamagata's tree count comes to 210,173 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Yamagata 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 · 山形市下山家８１－５, 3.7 km away · median of 3 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
8.0
PM10
—
NO₂
13.2
O₃
—
SO₂
0.0
CO
343.7
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 Yamagata's daily AQI at 27 on average, from 14 on Nov 10 to an hourly peak of 72 on Nov 6.
Where Yamagata stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Yamagata: Healthy tree cover
66.9% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
210,173
Target trees
210,173
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Yamagata lost?
Since 2001, the area within 10 km of Yamagata has lost about 258 hectares of forest (about 360 football pitches): 1.5% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 27 hectares (11%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area about 4 km south of the city center.
- Forest lost since 2001
- 258 haabout 360 football pitches
- Share of its forest
- 1.5%of what there was in 2000
- Cleared for good
- 27 hadeforestation: turned into farms, mines or towns
The worst year was 2024, when about 26 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 | 6 ha | 11 ha | 17 ha |
| 2002 | 2 ha | 9 ha | 12 ha |
| 2003 | under 1 ha | 1 ha | 1 ha |
| 2004 | 3 ha | 15 ha | 18 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 1 ha | 11 ha | 12 ha |
| 2007 | 3 ha | 16 ha | 19 ha |
| 2008 | 2 ha | 16 ha | 18 ha |
| 2009 | 2 ha | 9 ha | 11 ha |
| 2010 | 1 ha | 11 ha | 12 ha |
| 2011 | 1 ha | 5 ha | 6 ha |
| 2012 | 3 ha | 14 ha | 18 ha |
| 2013 | under 1 ha | 1 ha | 2 ha |
| 2014 | under 1 ha | 7 ha | 7 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | 7 ha | 7 ha |
| 2017 | under 1 ha | 3 ha | 3 ha |
| 2018 | under 1 ha | 9 ha | 10 ha |
| 2019 | under 1 ha | 24 ha | 24 ha |
| 2020 | under 1 ha | 9 ha | 9 ha |
| 2021 | under 1 ha | 5 ha | 5 ha |
| 2022 | under 1 ha | 9 ha | 9 ha |
| 2023 | under 1 ha | 11 ha | 11 ha |
| 2024 | under 1 ha | 26 ha | 26 ha |
| 2025 | under 1 ha | 3 ha | 3 ha |
What is causing deforestation around Yamagata?
- Loggingcan grow back83% · 214 ha
- Towns and roadscleared for good8.9% · 23 ha
- Unknown causescause unknown6.5% · 17 ha
Also: mining and energy, 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
- 17,300 ha
- Forest in 2020
- 17,300 ha
- Overall change
- +14 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Yamagata stayed about the same size, at about 17,300 hectares: new forest grew on about 140 hectares, and about 126 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 Yamagata
What is the air quality (AQI) in Yamagata right now?
The latest reading for Yamagata 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 山形市下山家８１－５, 3.7 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Yamagata 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 Yamagata been like this week?
Over the last 7 days, the CAMS air-quality model put Yamagata's daily AQI at 27 on average, from 14 on Nov 10 to an hourly peak of 72 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Yamagata lost since 2001?
Since 2001, the area within 10 km of Yamagata has lost about 258 hectares of forest (about 360 football pitches): 1.5% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 27 hectares (11%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Yamagata stayed about the same size, at about 17,300 hectares: new forest grew on about 140 hectares, and about 126 hectares were lost.
What is the tree count in Yamagata?
Yamagata has an estimated 210,173 trees across the 12.57 km² measured — 66.9% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Yamagata need?
Yamagata has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Yamagata's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Hirashimizu, 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 Hirashimizu; the tree count is an estimate derived from that cover.
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