City report · Chiba, Japan
Chiba Air quality today
Air quality in Chiba 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
- 7.1%
- trees in this area
- 18.9K
- more trees needed
- 60.9K
Measured across a 2 km radius around Shinmeicho, Chuo Ward, Chiba, 260-0022, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Chiba · AQI 18 (Good)
Chiba's tree count comes to 18,870 trees across 10.63 km² of land, 23 points below the 30% tree-cover level considered healthy for this area, so roughly 60,863 more trees would close the gap.
Air quality detail
Air quality in Chiba 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, 3 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 Chiba's daily AQI at 51 on average, from 34 on Nov 11 to an hourly peak of 123 on Nov 6.
Where Chiba stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Chiba: Critically low
7.1% tree cover against a 30% healthy-neighborhood target, across 10.63 km² of land.
Trees in this area
18,870
Target trees
79,733
More trees needed
60,863
CO₂ if planted / yr
1,339 t
Deforestation · 2001–2025
How much forest has Chiba lost?
Since 2001, the area within 10 km of Chiba has lost about 119 hectares of forest (about 170 football pitches): 4% of the forest it had in 2000. Most of it (90%) 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 east of the city center.
- Forest lost since 2001
- 119 haabout 170 football pitches
- Share of its forest
- 4%of what there was in 2000
- Cleared for good
- 107 hadeforestation: turned into farms, mines or towns
The worst year was 2018, when about 14 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 | 1 ha | under 1 ha | 2 ha |
| 2002 | 2 ha | under 1 ha | 2 ha |
| 2003 | 1 ha | under 1 ha | 2 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | 7 ha | under 1 ha | 7 ha |
| 2006 | 6 ha | 2 ha | 8 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | 3 ha | under 1 ha | 3 ha |
| 2009 | 4 ha | under 1 ha | 5 ha |
| 2010 | 3 ha | under 1 ha | 3 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 4 ha | 1 ha | 5 ha |
| 2013 | 2 ha | under 1 ha | 3 ha |
| 2014 | 4 ha | under 1 ha | 4 ha |
| 2015 | 2 ha | under 1 ha | 2 ha |
| 2016 | 11 ha | 1 ha | 12 ha |
| 2017 | 5 ha | under 1 ha | 5 ha |
| 2018 | 14 ha | under 1 ha | 14 ha |
| 2019 | 7 ha | under 1 ha | 7 ha |
| 2020 | 7 ha | under 1 ha | 7 ha |
| 2021 | 8 ha | under 1 ha | 8 ha |
| 2022 | 3 ha | under 1 ha | 3 ha |
| 2023 | 5 ha | under 1 ha | 5 ha |
| 2024 | 3 ha | under 1 ha | 3 ha |
| 2025 | 6 ha | 2 ha | 8 ha |
What is causing deforestation around Chiba?
- Towns and roadscleared for good88% · 105 ha
- Farms, pasture and plantationscleared for good2% · 2 ha
- Unknown causescause unknown9.9% · 12 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
- 4,500 ha
- Forest in 2020
- 4,420 ha
- Overall change
- −83 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Chiba stayed about the same size, at about 4,420 hectares: new forest grew on about 148 hectares, and about 230 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 Chiba
What is the air quality (AQI) in Chiba right now?
The latest reading for Chiba shows an AQI of 18 (Good), measured Nov 12, 01:05 local time by the NASA GSFC Rutgers Calib. N6 ground monitoring station, 3 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Chiba 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 Chiba been like this week?
Over the last 7 days, the CAMS air-quality model put Chiba'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 Chiba lost since 2001?
Since 2001, the area within 10 km of Chiba has lost about 119 hectares of forest (about 170 football pitches): 4% of the forest it had in 2000. Most of it (90%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Chiba stayed about the same size, at about 4,420 hectares: new forest grew on about 148 hectares, and about 230 hectares were lost.
What is the tree count in Chiba?
Chiba has an estimated 18,870 trees across the 10.63 km² of land measured — 7.1% tree cover, 23 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Chiba need?
Chiba needs roughly 60,863 more trees to close a 23-point shortfall against its 30% tree-cover target — about 1,339 t of extra CO₂ absorbed per year once grown.
How are Chiba's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Shinmeicho, 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 Shinmeicho; the tree count is an estimate derived from that cover.
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