City report · Chiba, Japan
Ichihara Air quality today
Air quality in Ichihara currently reads AQI 18 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 18
Good
- PM2.5, fine particles (µg/m³)
- 3.3
- tree cover
- 9.0%
- trees in this area
- 27.9K
- more trees needed
- 65.2K
Measured across a 2 km radius around Goi, Ichihara, Chiba 290-0056, Japan (12.57 km²), from a satellite image of Jul 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ichihara · AQI 18 (Good)
Ichihara's tree count comes to 27,935 trees across 12.42 km² of land, 21 points below the 30% tree-cover level considered healthy for this area, so roughly 65,182 more trees would close the gap.
Air quality detail
Air quality in Ichihara today: AQI 18, Good
Main pollutant: PM2.5 · Observed Nov 12, 01:05 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · NASA GSFC Rutgers Calib. N6, 12.2 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.3
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · Clarity
- 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 Ichihara's daily AQI at 51 on average, from 34 on Nov 11 to an hourly peak of 123 on Nov 6.
Where Ichihara stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ichihara: Critically low
9.0% tree cover against a 30% healthy-neighborhood target, across 12.42 km² of land.
Trees in this area
27,935
Target trees
93,117
More trees needed
65,182
CO₂ if planted / yr
1,434 t
Deforestation · 2001–2025
How much forest has Ichihara lost?
Since 2001, the area within 10 km of Ichihara has lost about 243 hectares of forest (about 340 football pitches): 5.9% of the forest it had in 2000. Most of it (94%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from September 2017 of a 5 × 5 km area about 7 km south of the city center.
- Forest lost since 2001
- 243 haabout 340 football pitches
- Share of its forest
- 5.9%of what there was in 2000
- Cleared for good
- 229 hadeforestation: turned into farms, mines or towns
The worst year was 2018, when about 34 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 | 9 ha | under 1 ha | 9 ha |
| 2002 | 6 ha | under 1 ha | 6 ha |
| 2003 | 3 ha | under 1 ha | 3 ha |
| 2004 | 6 ha | 1 ha | 7 ha |
| 2005 | 4 ha | 1 ha | 6 ha |
| 2006 | 11 ha | 2 ha | 13 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | 14 ha | under 1 ha | 14 ha |
| 2009 | 11 ha | 1 ha | 12 ha |
| 2010 | 2 ha | under 1 ha | 2 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 9 ha | under 1 ha | 10 ha |
| 2013 | 3 ha | under 1 ha | 3 ha |
| 2014 | 6 ha | under 1 ha | 7 ha |
| 2015 | 10 ha | under 1 ha | 10 ha |
| 2016 | 33 ha | under 1 ha | 33 ha |
| 2017 | 21 ha | under 1 ha | 22 ha |
| 2018 | 34 ha | under 1 ha | 34 ha |
| 2019 | 14 ha | under 1 ha | 15 ha |
| 2020 | 10 ha | under 1 ha | 10 ha |
| 2021 | 4 ha | under 1 ha | 5 ha |
| 2022 | 4 ha | under 1 ha | 5 ha |
| 2023 | 4 ha | under 1 ha | 5 ha |
| 2024 | 4 ha | under 1 ha | 4 ha |
| 2025 | 8 ha | 2 ha | 10 ha |
What is causing deforestation around Ichihara?
- Towns and roadscleared for good82% · 200 ha
- Farms, pasture and plantationscleared for good7.3% · 18 ha
- Mining and energycleared for good4.8% · 12 ha
Also: logging, 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
- 5,090 ha
- Forest in 2020
- 4,830 ha
- Overall change
- −267 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ichihara shrank from about 5,090 hectares to 4,830 hectares, a net loss of about 267 hectares (−5.2%). New forest grew on about 125 hectares, but 393 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 Ichihara
What is the air quality (AQI) in Ichihara right now?
The latest reading for Ichihara shows an AQI of 18 (Good), measured Nov 12, 01:05 local time by the NASA GSFC Rutgers Calib. N6 ground monitoring station, 12.2 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Ichihara today?
At AQI 18 (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 Ichihara been like this week?
Over the last 7 days, the CAMS air-quality model put Ichihara's daily AQI at 51 on average, from 34 on Nov 11 to an hourly peak of 123 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 Ichihara lost since 2001?
Since 2001, the area within 10 km of Ichihara has lost about 243 hectares of forest (about 340 football pitches): 5.9% of the forest it had in 2000. Most of it (94%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Ichihara shrank from about 5,090 hectares to 4,830 hectares, a net loss of about 267 hectares (−5.2%). New forest grew on about 125 hectares, but 393 hectares were lost.
What is the tree count in Ichihara?
Ichihara has an estimated 27,935 trees across the 12.42 km² of land measured — 9.0% tree cover, 21 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Ichihara need?
Ichihara needs roughly 65,182 more trees to close a 21-point shortfall against its 30% tree-cover target — about 1,434 t of extra CO₂ absorbed per year once grown.
How are Ichihara's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Goi, 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 Goi; the tree count is an estimate derived from that cover.
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