Japan · Gunma · 5 cities
Air quality in Gunma today The AQI right now, city by city
Right now, Takasaki has the cleanest air of the 5 cities we track in Gunma (AQI 33, Good), and Kiryū the worst (AQI 40, Good). Ōta has the most tree cover, at 18.5% — #62 of 207 cities measured in Japan.
Every city is measured the same way, over the same 2 km around its center: the air quality right now, from ground stations where there are any, and its tree cover.
AQI 36
Average right now
Good
- cities tracked
- 5
- average tree cover
- 9.3%
- Japan: 16.4%
- worst air now: Kiryū
- 40
- cleanest air now: Takasaki
- 33
Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf, refreshed hourly.
Gunma · average AQI 36
Air quality today across Gunma, city by city
| Takasaki | 33Good | 2.4% | 86.7K | #204 of 207 |
|---|---|---|---|---|
| Maebashi | 33Good | 4.4% | 80.4K | #180 of 207 |
| Ōta | 39Good | 18.5% | 36.1K | #62 of 207 |
| Isesaki | 33Good | 5.3% | 77.6K | #168 of 207 |
| Kiryū | 40Good | 15.7% | 44.8K | #78 of 207 |
Air quality is the US AQI from ground monitoring stations via OpenAQ where available, otherwise the Open-Meteo / CAMS model, refreshed hourly. Tree cover is measured within 2 km of each city center from Sentinel-2 imagery; the rank compares every city measured in Japan.
Deforestation · 2001–2025
How much forest has Gunma lost?
Since 2001, Gunma has lost about 10,900 hectares of forest (about 15,000 football pitches): 2.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 1,430 hectares (13%) was deforestation: forest cleared for good for farms, mines or towns.
- Forest lost since 2001
- 10,900 haabout 15,000 football pitches
- Share of its forest
- 2.4%of what there was in 2000
- Cleared for good
- 1,430 hadeforestation: turned into farms, mines or towns
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 43 ha | 362 ha | 405 ha |
| 2002 | 47 ha | 330 ha | 377 ha |
| 2003 | 8 ha | 109 ha | 117 ha |
| 2004 | 25 ha | 195 ha | 220 ha |
| 2005 | 84 ha | 361 ha | 445 ha |
| 2006 | 23 ha | 121 ha | 144 ha |
| 2007 | 124 ha | 670 ha | 794 ha |
| 2008 | 51 ha | 277 ha | 328 ha |
| 2009 | 90 ha | 412 ha | 502 ha |
| 2010 | 79 ha | 533 ha | 612 ha |
| 2011 | 33 ha | 317 ha | 350 ha |
| 2012 | 43 ha | 362 ha | 405 ha |
| 2013 | 29 ha | 176 ha | 205 ha |
| 2014 | 42 ha | 230 ha | 272 ha |
| 2015 | 74 ha | 241 ha | 315 ha |
| 2016 | 118 ha | 586 ha | 704 ha |
| 2017 | 160 ha | 373 ha | 533 ha |
| 2018 | 124 ha | 491 ha | 615 ha |
| 2019 | 38 ha | 434 ha | 472 ha |
| 2020 | 57 ha | 542 ha | 598 ha |
| 2021 | 26 ha | 496 ha | 522 ha |
| 2022 | 26 ha | 483 ha | 509 ha |
| 2023 | 19 ha | 437 ha | 456 ha |
| 2024 | 29 ha | 441 ha | 470 ha |
| 2025 | 40 ha | 463 ha | 503 ha |
Forest loss has stayed about the same: about 492 hectares a year in 2021–2025, against 584 hectares a year in 2016–2020. The worst year was 2007, when about 794 hectares of forest were lost.
What is causing deforestation in Gunma?
- Loggingcan grow back82% · 8,950 ha
- Towns and roadscleared for good7.8% · 848 ha
- Mining and energycleared for good3.4% · 367 ha
Also: farms, pasture and plantations, storms, floods and other natural causes, wildfires, shifting farming, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
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. How it's measured
Other prefectures in Japan
Clean-air buying guides
Cleaner air at home in Gunma
Picked by tested clean-air delivery rate (CADR), noise and running cost, from independent test labels. No brand pays to be listed.
- The best air purifiers for wildfire smoke and smog
Air purifiers that keep up with wildfire smoke and winter smog, ranked by verified smoke CADR, with the room each one clears on a smoky day.
- The best air purifiers for bedrooms: quiet picks sized for your room
Quiet HEPA air purifiers for bedrooms, compared on what matters at night: noise on the lowest setting (from 20 dB), verified room size and filter cost.
- The best air purifiers under $200
Good HEPA air purifiers under $200 at the makers' own prices, compared on verified clean air, room size and what the filters cost each year.
Your own street