City report · Aomori, Japan
Hirosaki Air quality today
Air quality in Hirosaki currently reads AQI 17 (Good): Air quality is satisfactory for everyone.
AQI 17
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 3.0
- tree cover
- 13.7%
- trees in this area
- 43.0K
- more trees needed
- 51.2K
Measured across a 2 km radius around Fujimicho, Hirosaki, Aomori 036-8223, Japan (12.57 km²), from a satellite image of Aug 4, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hirosaki · AQI 17 (Good)
Hirosaki's tree count comes to 43,040 trees across 12.57 km², 16 points below the 30% tree-cover level considered healthy for this area, so roughly 51,208 more trees would close the gap.
Air quality detail
Air quality in Hirosaki today: AQI 17, 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 · 弘前市中野１－１－１, 1.3 km away · median of 2 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.0
PM10
—
NO₂
13.2
O₃
—
SO₂
—
CO
229.1
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 Hirosaki's daily AQI at 34 on average, from 23 on Nov 5 to an hourly peak of 65 on Nov 8.
Where Hirosaki stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hirosaki: Critically low
13.7% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
43,040
Target trees
94,248
More trees needed
51,208
CO₂ if planted / yr
1,127 t
Deforestation · 2001–2025
How much forest has Hirosaki lost?
Since 2001, the area within 10 km of Hirosaki has lost about 345 hectares of forest (about 480 football pitches): 3.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 11 hectares (3.2%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area about 7 km southwest of the city center.
- Forest lost since 2001
- 345 haabout 480 football pitches
- Share of its forest
- 3.1%of what there was in 2000
- Cleared for good
- 11 hadeforestation: turned into farms, mines or towns
The worst year was 2020, when about 54 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 | 2 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 4 ha | 5 ha |
| 2005 | under 1 ha | 3 ha | 3 ha |
| 2006 | under 1 ha | 1 ha | 1 ha |
| 2007 | under 1 ha | 8 ha | 8 ha |
| 2008 | under 1 ha | under 1 ha | 2 ha |
| 2009 | under 1 ha | 3 ha | 4 ha |
| 2010 | 1 ha | 20 ha | 21 ha |
| 2011 | under 1 ha | 21 ha | 22 ha |
| 2012 | 3 ha | 13 ha | 16 ha |
| 2013 | under 1 ha | 18 ha | 19 ha |
| 2014 | 2 ha | 12 ha | 13 ha |
| 2015 | under 1 ha | 8 ha | 8 ha |
| 2016 | under 1 ha | 38 ha | 39 ha |
| 2017 | under 1 ha | 27 ha | 27 ha |
| 2018 | under 1 ha | 18 ha | 18 ha |
| 2019 | under 1 ha | 14 ha | 14 ha |
| 2020 | under 1 ha | 54 ha | 54 ha |
| 2021 | under 1 ha | 16 ha | 16 ha |
| 2022 | under 1 ha | 20 ha | 20 ha |
| 2023 | under 1 ha | 5 ha | 5 ha |
| 2024 | under 1 ha | 21 ha | 22 ha |
| 2025 | under 1 ha | 6 ha | 6 ha |
What is causing deforestation around Hirosaki?
- Loggingcan grow back94% · 323 ha
- Farms, pasture and plantationscleared for good3.1% · 11 ha
- Unknown causescause unknown3.4% · 12 ha
Also: towns and roads.
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
- 9,470 ha
- Forest in 2020
- 8,680 ha
- Overall change
- −791 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hirosaki shrank from about 9,470 hectares to 8,680 hectares, a net loss of about 791 hectares (−8.4%). New forest grew on about 139 hectares, but 930 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 Hirosaki
What is the air quality (AQI) in Hirosaki right now?
The latest reading for Hirosaki shows an AQI of 17 (Good), measured Nov 12, 02:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 弘前市中野１－１－１, 1.3 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Hirosaki today?
At AQI 17 (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 Hirosaki been like this week?
Over the last 7 days, the CAMS air-quality model put Hirosaki's daily AQI at 34 on average, from 23 on Nov 5 to an hourly peak of 65 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Hirosaki lost since 2001?
Since 2001, the area within 10 km of Hirosaki has lost about 345 hectares of forest (about 480 football pitches): 3.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 11 hectares (3.2%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Hirosaki shrank from about 9,470 hectares to 8,680 hectares, a net loss of about 791 hectares (−8.4%). New forest grew on about 139 hectares, but 930 hectares were lost.
What is the tree count in Hirosaki?
Hirosaki has an estimated 43,040 trees across the 12.57 km² measured — 13.7% tree cover, 16 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Hirosaki need?
Hirosaki needs roughly 51,208 more trees to close a 16-point shortfall against its 30% tree-cover target — about 1,127 t of extra CO₂ absorbed per year once grown.
How are Hirosaki's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Fujimicho, 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 Fujimicho; the tree count is an estimate derived from that cover.
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