City report · Hiroshima, Japan
Hiroshima Air quality today
Air quality in Hiroshima currently reads AQI 38 (Good): Air quality is satisfactory for everyone.
AQI 38
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.9
- tree cover
- 13.3%
- trees in this area
- 37.7K
- more trees needed
- 47.4K
Measured across a 2 km radius around 2 Chome-3 Tokaichimachi, Naka Ward, Hiroshima, 730-0805, Japan (12.57 km²), from a satellite image of Aug 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hiroshima · AQI 38 (Good)
Hiroshima's tree count comes to 37,730 trees across 11.35 km² of land, 17 points below the 30% tree-cover level considered healthy for this area, so roughly 47,376 more trees would close the gap.
Air quality detail
Air quality in Hiroshima today: AQI 38, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Eikei, 1.7 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.9
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, japanmwl
- 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 Hiroshima's daily AQI at 39 on average, from 24 on Nov 10 to an hourly peak of 69 on Nov 6.
Where Hiroshima stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hiroshima: Critically low
13.3% tree cover against a 30% healthy-neighborhood target, across 11.35 km² of land.
Trees in this area
37,730
Target trees
85,106
More trees needed
47,376
CO₂ if planted / yr
1,042 t
Deforestation · 2001–2025
How much forest has Hiroshima lost?
Since 2001, the area within 10 km of Hiroshima has lost about 465 hectares of forest (about 650 football pitches): 4.9% of the forest it had in 2000. Most of it (93%) 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
- 465 haabout 650 football pitches
- Share of its forest
- 4.9%of what there was in 2000
- Cleared for good
- 432 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 61 hectares of forest were lost.
Hiroshima's full deforestation reportHectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 60 ha | 1 ha | 61 ha |
| 2002 | 42 ha | 2 ha | 44 ha |
| 2003 | 6 ha | 4 ha | 11 ha |
| 2004 | 2 ha | 2 ha | 4 ha |
| 2005 | 8 ha | 1 ha | 9 ha |
| 2006 | 44 ha | under 1 ha | 44 ha |
| 2007 | 57 ha | 2 ha | 59 ha |
| 2008 | 14 ha | 2 ha | 16 ha |
| 2009 | 8 ha | under 1 ha | 9 ha |
| 2010 | 3 ha | 1 ha | 5 ha |
| 2011 | 4 ha | 1 ha | 5 ha |
| 2012 | 47 ha | 1 ha | 49 ha |
| 2013 | 28 ha | under 1 ha | 29 ha |
| 2014 | 4 ha | under 1 ha | 4 ha |
| 2015 | 6 ha | under 1 ha | 6 ha |
| 2016 | 9 ha | 1 ha | 10 ha |
| 2017 | 12 ha | under 1 ha | 12 ha |
| 2018 | 7 ha | under 1 ha | 7 ha |
| 2019 | 6 ha | under 1 ha | 6 ha |
| 2020 | 9 ha | under 1 ha | 9 ha |
| 2021 | 15 ha | under 1 ha | 16 ha |
| 2022 | 15 ha | under 1 ha | 15 ha |
| 2023 | 10 ha | 1 ha | 11 ha |
| 2024 | 7 ha | under 1 ha | 7 ha |
| 2025 | 10 ha | 7 ha | 17 ha |
What is causing deforestation around Hiroshima?
- Towns and roadscleared for good93% · 431 ha
- Loggingcan grow back3.3% · 16 ha
- Unknown causescause unknown3.7% · 17 ha
Also: mining and energy.
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
- 10,200 ha
- Forest in 2020
- 9,890 ha
- Overall change
- −275 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hiroshima shrank from about 10,200 hectares to 9,890 hectares, a net loss of about 275 hectares (−2.7%). New forest grew on about 92 hectares, but 366 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 Hiroshima
Same 2 km radius, same index — so they compare directly.
- Hatsukaichi12.1 km
Japan
- Tree cover
- 13%
- Air quality
- 38
- Kure21.5 km
Japan
- Tree cover
- 61%
- Air quality
- 38
- Higashihiroshima26.3 km
Japan
- Tree cover
- 32%
- Air quality
- 38
- Iwakuni33.8 km
Japan
- Tree cover
- 17%
- Air quality
- 18
- Imabari62.5 km
Japan
- Tree cover
- 14%
- Air quality
- 28
- Matsuyama68.8 km
Japan
- Tree cover
- 8%
- Air quality
- 33
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Frequently asked
Questions about Hiroshima
What is the air quality (AQI) in Hiroshima right now?
The latest reading for Hiroshima shows an AQI of 38 (Good), measured Nov 12, 01:00 local time by the Eikei ground monitoring station, 1.7 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Hiroshima today?
At AQI 38 (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 Hiroshima been like this week?
Over the last 7 days, the CAMS air-quality model put Hiroshima's daily AQI at 39 on average, from 24 on Nov 10 to an hourly peak of 69 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 Hiroshima lost since 2001?
Since 2001, the area within 10 km of Hiroshima has lost about 465 hectares of forest (about 650 football pitches): 4.9% of the forest it had in 2000. Most of it (93%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Hiroshima shrank from about 10,200 hectares to 9,890 hectares, a net loss of about 275 hectares (−2.7%). New forest grew on about 92 hectares, but 366 hectares were lost.
What is the tree count in Hiroshima?
Hiroshima has an estimated 37,730 trees across the 11.35 km² of land measured — 13.3% tree cover, 17 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Hiroshima need?
Hiroshima needs roughly 47,376 more trees to close a 17-point shortfall against its 30% tree-cover target — about 1,042 t of extra CO₂ absorbed per year once grown.
How are Hiroshima's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 2 Chome-3 Tokaichimachi, 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-3 Tokaichimachi; the tree count is an estimate derived from that cover.
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