City report · Ehime, Japan
Niihama Air quality today
Air quality in Niihama currently reads AQI 34 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 34
Good
- PM2.5, fine particles (µg/m³)
- 4.9
- tree cover
- 22.3%
- trees in this area
- 70.1K
- more trees needed
- 24.2K
Measured across a 2 km radius around 1 Chome-16 Go, Niihama, Ehime 792-0886, Japan (12.57 km²), from a satellite image of Aug 30, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Niihama · AQI 34 (Good)
Niihama's tree count comes to 70,058 trees across 12.57 km², 8 points below the 30% tree-cover level considered healthy for this area, so roughly 24,190 more trees would close the gap.
Air quality detail
Air quality in Niihama today: AQI 34, Good
Main pollutant: PM2.5 · Observed Nov 11, 11:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.9
PM10
6.8
NO₂
12.5
O₃
77.0
SO₂
9.4
CO
123.0
- 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 Niihama's daily AQI at 38 on average, from 28 on Nov 10 to an hourly peak of 68 on Nov 6.
Where Niihama stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Niihama: Below target
22.3% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
70,058
Target trees
94,248
More trees needed
24,190
CO₂ if planted / yr
532.2 t
Deforestation · 2001–2025
How much forest has Niihama lost?
Since 2001, the area within 10 km of Niihama has lost about 185 hectares of forest (about 260 football pitches): 1.6% of the forest it had in 2000. The biggest cause was logging (47%), after which forest can grow back. About 77 hectares (41%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from June 2017 of a 5 × 5 km area about 7 km south of the city center.
- Forest lost since 2001
- 185 haabout 260 football pitches
- Share of its forest
- 1.6%of what there was in 2000
- Cleared for good
- 77 hadeforestation: turned into farms, mines or towns
The worst year was 2007, when about 20 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 | under 1 ha | under 1 ha | 1 ha |
| 2002 | 7 ha | 6 ha | 13 ha |
| 2003 | under 1 ha | 1 ha | 2 ha |
| 2004 | 5 ha | 9 ha | 14 ha |
| 2005 | 7 ha | 6 ha | 13 ha |
| 2006 | under 1 ha | 3 ha | 4 ha |
| 2007 | 17 ha | 3 ha | 20 ha |
| 2008 | 8 ha | 2 ha | 9 ha |
| 2009 | 7 ha | 9 ha | 15 ha |
| 2010 | 1 ha | 3 ha | 5 ha |
| 2011 | 1 ha | under 1 ha | 2 ha |
| 2012 | 1 ha | 2 ha | 4 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | 1 ha | 2 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 4 ha | 3 ha | 7 ha |
| 2017 | under 1 ha | 7 ha | 7 ha |
| 2018 | 3 ha | 12 ha | 15 ha |
| 2019 | 9 ha | 6 ha | 15 ha |
| 2020 | 4 ha | 4 ha | 8 ha |
| 2021 | under 1 ha | 2 ha | 2 ha |
| 2022 | under 1 ha | 11 ha | 11 ha |
| 2023 | under 1 ha | 3 ha | 3 ha |
| 2024 | under 1 ha | 4 ha | 4 ha |
| 2025 | under 1 ha | 8 ha | 8 ha |
What is causing deforestation around Niihama?
- Loggingcan grow back47% · 86 ha
- Towns and roadscleared for good34% · 62 ha
- Mining and energycleared for good8% · 15 ha
Also: wildfires, 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
- 12,400 ha
- Forest in 2020
- 12,400 ha
- Overall change
- −46 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Niihama stayed about the same size, at about 12,400 hectares: new forest grew on about 43 hectares, and about 88 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 Niihama
What is the air quality (AQI) in Niihama right now?
The latest reading for Niihama shows an AQI of 34 (Good), observed Nov 11, 11:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Niihama today?
At AQI 34 (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 Niihama been like this week?
Over the last 7 days, the CAMS air-quality model put Niihama's daily AQI at 38 on average, from 28 on Nov 10 to an hourly peak of 68 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 Niihama lost since 2001?
Since 2001, the area within 10 km of Niihama has lost about 185 hectares of forest (about 260 football pitches): 1.6% of the forest it had in 2000. The biggest cause was logging (47%), after which forest can grow back. About 77 hectares (41%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Niihama stayed about the same size, at about 12,400 hectares: new forest grew on about 43 hectares, and about 88 hectares were lost.
What is the tree count in Niihama?
Niihama has an estimated 70,058 trees across the 12.57 km² measured — 22.3% tree cover, 8 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Niihama need?
Niihama needs roughly 24,190 more trees to close a 8-point shortfall against its 30% tree-cover target — about 532.2 t of extra CO₂ absorbed per year once grown.
How are Niihama's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 1 Chome-16 Go; the tree count is an estimate derived from that cover.
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