City report · Chiba, Japan
Yachiyo Air quality today
Air quality in Yachiyo currently reads AQI 39 (Good): Air quality is satisfactory for everyone.
AQI 39
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 7.0
- tree cover
- 31.4%
- trees in this area
- 98.4K
- more trees needed
- 0
Measured across a 2 km radius around Murakami, Yachiyo, Chiba 276-0028, Japan (12.57 km²), from a satellite image of Aug 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Yachiyo · AQI 39 (Good)
Yachiyo's tree count comes to 98,449 trees across 12.54 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Yachiyo today: AQI 39, 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 · 千葉市花見川区花見川４－１, 5.2 km away · median of 9 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
7.0
PM10
—
NO₂
39.5
O₃
—
SO₂
0.0
CO
343.7
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 Yachiyo's daily AQI at 51 on average, from 34 on Nov 11 to an hourly peak of 123 on Nov 6.
Where Yachiyo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Yachiyo: Healthy tree cover
31.4% tree cover against a 30% healthy-neighborhood target, across 12.54 km² of land.
Trees in this area
98,449
Target trees
98,449
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Yachiyo lost?
Since 2001, the area within 10 km of Yachiyo has lost about 131 hectares of forest (about 180 football pitches): 2.4% of the forest it had in 2000. Most of it (81%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 131 haabout 180 football pitches
- Share of its forest
- 2.4%of what there was in 2000
- Cleared for good
- 107 hadeforestation: turned into farms, mines or towns
The worst year was 2009, 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 | 5 ha | under 1 ha | 6 ha |
| 2003 | 2 ha | under 1 ha | 3 ha |
| 2004 | 3 ha | under 1 ha | 4 ha |
| 2005 | 4 ha | under 1 ha | 5 ha |
| 2006 | 11 ha | 2 ha | 13 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | 12 ha | 2 ha | 14 ha |
| 2009 | 12 ha | 2 ha | 14 ha |
| 2010 | 9 ha | 2 ha | 11 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 10 ha | 3 ha | 14 ha |
| 2013 | 3 ha | under 1 ha | 4 ha |
| 2014 | 1 ha | under 1 ha | 1 ha |
| 2015 | 4 ha | under 1 ha | 5 ha |
| 2016 | 6 ha | under 1 ha | 6 ha |
| 2017 | 6 ha | under 1 ha | 7 ha |
| 2018 | 6 ha | under 1 ha | 7 ha |
| 2019 | 1 ha | under 1 ha | 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | 3 ha | under 1 ha | 3 ha |
| 2024 | 4 ha | under 1 ha | 4 ha |
| 2025 | 2 ha | 4 ha | 6 ha |
What is causing deforestation around Yachiyo?
- Towns and roadscleared for good81% · 106 ha
- Unknown causescause unknown18% · 24 ha
Also: logging.
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
- 7,000 ha
- Forest in 2020
- 6,740 ha
- Overall change
- −266 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Yachiyo shrank from about 7,000 hectares to 6,740 hectares, a net loss of about 266 hectares (−3.8%). New forest grew on about 137 hectares, but 403 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 Yachiyo
What is the air quality (AQI) in Yachiyo right now?
The latest reading for Yachiyo shows an AQI of 39 (Good), measured Nov 12, 02:00 local time by 9 ground monitoring stations via OpenAQ (the median of their readings; the nearest is 千葉市花見川区花見川４－１, 5.2 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Yachiyo today?
At AQI 39 (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 Yachiyo been like this week?
Over the last 7 days, the CAMS air-quality model put Yachiyo'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 Yachiyo lost since 2001?
Since 2001, the area within 10 km of Yachiyo has lost about 131 hectares of forest (about 180 football pitches): 2.4% of the forest it had in 2000. Most of it (81%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Yachiyo shrank from about 7,000 hectares to 6,740 hectares, a net loss of about 266 hectares (−3.8%). New forest grew on about 137 hectares, but 403 hectares were lost.
What is the tree count in Yachiyo?
Yachiyo has an estimated 98,449 trees across the 12.54 km² of land measured — 31.4% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Yachiyo need?
Yachiyo has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Yachiyo's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Murakami, 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 Murakami; the tree count is an estimate derived from that cover.
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