City report · Ibaraki, Japan
Hitachi Air quality today
Air quality in Hitachi currently reads AQI 2 (Good): Air quality is satisfactory for everyone.
AQI 2
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 0.3
- tree cover
- 34.5%
- trees in this area
- 104K
- more trees needed
- 0
Measured across a 2 km radius around 2 Chome-1 Takasuzucho, Hitachi, Ibaraki, Japan (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hitachi · AQI 2 (Good)
Hitachi's tree count comes to 103,724 trees across 12.03 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Hitachi today: AQI 2, Good
Main pollutant: PM2.5 · Observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 49 ground-station cities within 205 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 49 station cities within 205 km, e.g. Mito and Chikusei
Health signal
Air quality is satisfactory for everyone.
PM2.5
0.3
PM10
2.0
NO₂
1.4
O₃
84.0
SO₂
1.3
CO
129.0
- 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 Hitachi's daily AQI at 15 on average, from 3 on Nov 7 to an hourly peak of 52 on Nov 6.
Where Hitachi stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hitachi: Healthy tree cover
34.5% tree cover against a 30% healthy-neighborhood target, across 12.03 km² of land.
Trees in this area
103,724
Target trees
103,724
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Hitachi lost?
Since 2001, the area within 10 km of Hitachi has lost about 792 hectares of forest (about 1,100 football pitches): 6.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 150 hectares (19%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km northwest of the city center.
- Forest lost since 2001
- 792 haabout 1,100 football pitches
- Share of its forest
- 6.1%of what there was in 2000
- Cleared for good
- 150 hadeforestation: turned into farms, mines or towns
The worst year was 2018, when about 84 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 | 4 ha | 8 ha | 12 ha |
| 2002 | 6 ha | 20 ha | 27 ha |
| 2003 | 2 ha | 8 ha | 10 ha |
| 2004 | 7 ha | 10 ha | 18 ha |
| 2005 | 3 ha | 10 ha | 13 ha |
| 2006 | 11 ha | 23 ha | 34 ha |
| 2007 | 1 ha | 10 ha | 11 ha |
| 2008 | 3 ha | 4 ha | 7 ha |
| 2009 | 10 ha | 25 ha | 34 ha |
| 2010 | 4 ha | 46 ha | 50 ha |
| 2011 | 3 ha | 13 ha | 16 ha |
| 2012 | 6 ha | 38 ha | 44 ha |
| 2013 | under 1 ha | 27 ha | 28 ha |
| 2014 | under 1 ha | 11 ha | 11 ha |
| 2015 | 3 ha | 13 ha | 16 ha |
| 2016 | 5 ha | 39 ha | 44 ha |
| 2017 | 5 ha | 29 ha | 33 ha |
| 2018 | 46 ha | 37 ha | 84 ha |
| 2019 | under 1 ha | 11 ha | 12 ha |
| 2020 | 3 ha | 40 ha | 44 ha |
| 2021 | 5 ha | 28 ha | 33 ha |
| 2022 | 2 ha | 33 ha | 34 ha |
| 2023 | 1 ha | 51 ha | 52 ha |
| 2024 | 9 ha | 59 ha | 68 ha |
| 2025 | 10 ha | 48 ha | 58 ha |
What is causing deforestation around Hitachi?
- Loggingcan grow back79% · 625 ha
- Mining and energycleared for good12% · 93 ha
- Towns and roadscleared for good7.1% · 56 ha
Also: farms, pasture and plantations, 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
- 13,500 ha
- Forest in 2020
- 13,400 ha
- Overall change
- −101 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hitachi stayed about the same size, at about 13,400 hectares: new forest grew on about 106 hectares, and about 207 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 Hitachi
Same 2 km radius, same index — so they compare directly.
- Hitachi-Naka24.9 km
Japan
- Tree cover
- 12%
- Air quality
- 4
- Mito33.1 km
Japan
- Tree cover
- 14%
- Air quality
- 55
- Iwaki54.2 km
Japan
- Tree cover
- 31%
- Air quality
- 40
- Nasushiobara66.8 km
Japan
- Tree cover
- 44%
- Air quality
- 5
- Chikusei67.5 km
Japan
- Tree cover
- 6%
- Air quality
- 43
- Utsunomiya68.6 km
Japan
- Tree cover
- 10%
- Air quality
- 40
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Frequently asked
Questions about Hitachi
What is the air quality (AQI) in Hitachi right now?
The latest reading for Hitachi shows an AQI of 2 (Good), observed Nov 11, 11:00 local time via Open-Meteo / CAMS, corrected with 49 ground-station cities within 205 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Hitachi today?
At AQI 2 (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 Hitachi been like this week?
Over the last 7 days, the CAMS air-quality model put Hitachi's daily AQI at 15 on average, from 3 on Nov 7 to an hourly peak of 52 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 Hitachi lost since 2001?
Since 2001, the area within 10 km of Hitachi has lost about 792 hectares of forest (about 1,100 football pitches): 6.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 150 hectares (19%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Hitachi stayed about the same size, at about 13,400 hectares: new forest grew on about 106 hectares, and about 207 hectares were lost.
What is the tree count in Hitachi?
Hitachi has an estimated 103,724 trees across the 12.03 km² of land measured — 34.5% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Hitachi need?
Hitachi has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Hitachi'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 2 Chome-1 Takasuzucho; the tree count is an estimate derived from that cover.
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