City report · Ibaraki, Japan
Hitachi-Naka Air quality today
Air quality in Hitachi-Naka currently reads AQI 28 (Good): Air quality is satisfactory for everyone.
AQI 28
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 5.0
- tree cover
- 11.5%
- trees in this area
- 36.1K
- more trees needed
- 58.1K
Measured across a 2 km radius around 2 Chome-10 Higashiishikawa, Hitachinaka, Ibaraki 312-0052, Japan (12.57 km²), from a satellite image of Aug 19, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hitachi-Naka · AQI 28 (Good)
Hitachi-Naka's tree count comes to 36,128 trees across 12.57 km², 19 points below the 30% tree-cover level considered healthy for this area, so roughly 58,119 more trees would close the gap.
Air quality detail
Air quality in Hitachi-Naka today: AQI 28, 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 · 水戸市石川一丁目４０４３－８, 9.4 km away · median of 5 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.0
PM10
—
NO₂
7.5
O₃
—
SO₂
0.0
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 Hitachi-Naka's daily AQI at 21 on average, from 9 on Nov 7 to an hourly peak of 76 on Nov 6.
Where Hitachi-Naka stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hitachi-Naka: Critically low
11.5% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
36,128
Target trees
94,247
More trees needed
58,119
CO₂ if planted / yr
1,279 t
Deforestation · 2001–2025
How much forest has Hitachi-Naka lost?
Since 2001, the area within 10 km of Hitachi-Naka has lost about 306 hectares of forest (about 430 football pitches): 8.7% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km north of the city center.
- Forest lost since 2001
- 306 haabout 430 football pitches
- Share of its forest
- 8.7%of what there was in 2000
- Cleared for good
- 267 hadeforestation: turned into farms, mines or towns
The worst year was 2024, when about 31 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 | 2 ha | under 1 ha | 3 ha |
| 2002 | 6 ha | under 1 ha | 7 ha |
| 2003 | 11 ha | under 1 ha | 11 ha |
| 2004 | 6 ha | under 1 ha | 7 ha |
| 2005 | 2 ha | 2 ha | 4 ha |
| 2006 | 9 ha | 2 ha | 11 ha |
| 2007 | 7 ha | under 1 ha | 7 ha |
| 2008 | 3 ha | 1 ha | 4 ha |
| 2009 | 20 ha | 3 ha | 23 ha |
| 2010 | 5 ha | 1 ha | 6 ha |
| 2011 | 5 ha | 5 ha | 10 ha |
| 2012 | 15 ha | 3 ha | 18 ha |
| 2013 | 3 ha | 2 ha | 5 ha |
| 2014 | 5 ha | under 1 ha | 6 ha |
| 2015 | 6 ha | under 1 ha | 7 ha |
| 2016 | 17 ha | 2 ha | 18 ha |
| 2017 | 16 ha | under 1 ha | 17 ha |
| 2018 | 15 ha | under 1 ha | 16 ha |
| 2019 | 13 ha | under 1 ha | 13 ha |
| 2020 | 18 ha | under 1 ha | 19 ha |
| 2021 | 14 ha | under 1 ha | 14 ha |
| 2022 | 12 ha | under 1 ha | 12 ha |
| 2023 | 10 ha | under 1 ha | 10 ha |
| 2024 | 19 ha | 12 ha | 31 ha |
| 2025 | 27 ha | 1 ha | 29 ha |
What is causing deforestation around Hitachi-Naka?
- Towns and roadscleared for good87% · 267 ha
- Loggingcan grow back7.9% · 24 ha
- Unknown causescause unknown4.9% · 15 ha
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
- 3,960 ha
- Forest in 2020
- 3,670 ha
- Overall change
- −294 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hitachi-Naka shrank from about 3,960 hectares to 3,670 hectares, a net loss of about 294 hectares (−7.4%). New forest grew on about 106 hectares, but 400 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 Hitachi-Naka
What is the air quality (AQI) in Hitachi-Naka right now?
The latest reading for Hitachi-Naka shows an AQI of 28 (Good), measured Nov 12, 02:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 水戸市石川一丁目４０４３－８, 9.4 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Hitachi-Naka today?
At AQI 28 (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-Naka been like this week?
Over the last 7 days, the CAMS air-quality model put Hitachi-Naka's daily AQI at 21 on average, from 9 on Nov 7 to an hourly peak of 76 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-Naka lost since 2001?
Since 2001, the area within 10 km of Hitachi-Naka has lost about 306 hectares of forest (about 430 football pitches): 8.7% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Hitachi-Naka shrank from about 3,960 hectares to 3,670 hectares, a net loss of about 294 hectares (−7.4%). New forest grew on about 106 hectares, but 400 hectares were lost.
What is the tree count in Hitachi-Naka?
Hitachi-Naka has an estimated 36,128 trees across the 12.57 km² measured — 11.5% tree cover, 19 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Hitachi-Naka need?
Hitachi-Naka needs roughly 58,119 more trees to close a 19-point shortfall against its 30% tree-cover target — about 1,279 t of extra CO₂ absorbed per year once grown.
How are Hitachi-Naka's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 2 Chome-10 Higashiishikawa, 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-10 Higashiishikawa; the tree count is an estimate derived from that cover.
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