Kumamoto air quality now

Japan · The summary is refreshed every 15 minutes.

November 12

The air is moderate now

Measured 05:00

Kumamoto

10°C

Clear

56AQI

1027

hPa

Atmospheric
pressure

87%

Humidity

Kumamoto, November 10, 2026: daily mean PM2.5 6 µg/m³ (8 sensors), level “Low” — as in the Atmy Data Hub. Now (07:00 local time): 12.0 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in Kumamoto, PM2.5 averages 12.0 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 8 sensors from Government stations, readings from 05:00–05:00 local time (20:00–20:00 UTC), summary prepared at 07:00 local time. Median: 12.0 µg/m³; range across sensors: 10.0–14.0 µg/m³.

In Kumamoto the air is moderate 🟡 AQI 56. About the same as three hours ago. ☀️ +10 °C · No precipitation · Wind 2 m/s

In Kumamoto the air is moderate right now (approximate, US EPA scale). From 18:00 to 07:00 local time the city mean PM2.5 stayed roughly level: from 13.9 to 12.0 µg/m³.

Light wind (2 m/s) in the evening or at night, as the air cools, possibly traps particles near the ground (a temperature inversion). High humidity (87%) possibly makes optical sensors read somewhat higher.

Weather now: clear, 10°C, wind 2 m/s, humidity 87%. No major change in the wind is expected in the coming hours. By 18:00 the temperature will be about 18°C.

Written automatically at 07:00 local time (22:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.

2 m/s

Wind, N

0 mm

Precipitation today

Kumamoto: air quality for the completed day

Metric: PM2.5, µg/m³ · Color scale: EPA AQI · November 10, 2026 · 00:00–24:00 UTC = 09:00–09:00 UTC+9

6 µg/m³ Low

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 6 µg/m³ from 8 sensors that passed the quality check — the same value as in the Atmy Data Hub.

No. 5 of 43 cities in Japan and No. 608 of 676 worldwide, from the most polluted.

LowModerateElevatedHighVery highExtremely high

Pollution accumulation index now

43/100Moderate · An estimate of weather conditions · not a PM2.5 forecast

Now4341
07.0015.0022.0006.00

Pollution accumulation forecast

Today — November 12

20°/10°

Index by time of day

58/100Moderate

  1. 58/100Night
  2. 43/100Morning
  3. 9/100Day
  4. 25/100Evening

Friday — November 13

21°/13°

Index by time of day

57/100Moderate

  1. 57/100Night
  2. 42/100Morning
  3. 10/100Day
  4. 24/100Evening

Saturday — November 14

19°/14°

Index by time of day

56/100Moderate

  1. 56/100Night
  2. 42/100Morning
  3. 9/100Day
  4. 22/100Evening

Sunday — November 15

20°/15°

Index by time of day

56/100Moderate

  1. 56/100Night
  2. 42/100Morning
  3. 9/100Day
  4. 25/100Evening

Monday — November 16

21°/14°

Index by time of day

55/100Moderate

  1. 55/100Night
  2. 39/100Morning
  3. 5/100Day
  4. 27/100Evening

Tuesday — November 17

21°/11°

Index by time of day

61/100Moderate

  1. 61/100Night
  2. 44/100Morning
  3. 9/100Day
  4. 21/100Evening

Forecast of conditions that trap pollution near the surface

Weather

10°

Clear. Feels like 8°C

  1. MorningClear13°C71%
  2. DayPartly cloudy20°C58%
  3. EveningPartly cloudy16°C81%

Wind

2m/sWind from the N

2m/sWind gusts

Wind force: 2

Gusts up to 5 m/s are expected.

10-day weather forecast for Kumamoto

Japan

  1. TodayNov 12Partly cloudy20°C10°C
  2. FriNov 13Partly cloudy21°C13°C
  3. SatNov 14Cloudy19°C14°C
  4. SunNov 15Rain20°C15°C
  5. MonNov 16Cloudy21°C14°C
  6. TueNov 17Rain21°C11°C
  7. WedNov 18Rain18°C13°C
  8. ThuNov 19Partly cloudy13°C9°C
  9. FriNov 20Cloudy13°C8°C
  10. SatNov 21Cloudy16°C8°C

Where in Kumamoto is the air worse?

See all sensors

Highest current reading: 14.0 µg/m³ (水道町自排局 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市)). Lowest: 10.0 µg/m³ (北区役所 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市)). The list shows every sensor, highest first.

  1. 水道町自排局 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市) →14 µg/m³
  2. 城南町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市) →14 µg/m³
  3. 神水本町自排局 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市) →12 µg/m³
  4. 中島 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市) →12 µg/m³
  5. 楡木 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市) →12 µg/m³
  6. 秋津 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市) →11 µg/m³
  7. 京町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市) →11 µg/m³
  8. 北区役所 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市) →10 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: Government stations — 8 sensors.

Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.

Japan: sensors in total

921

  1. TokyoJapan

    49

  2. NagoyaJapan

    18

  3. KobeJapan

    16

Cities with the most sensors

All sensors on the map, by city as the map assigns them; the city’s values count only the sensors that pass the Data Hub’s quality check.

Air quality calendar: Kumamoto

Daily mean PM2.5 of the city sensors, µg/m³

Click a day to see its date and value.

LowModerateElevatedHighVery highExtremely high

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An Atmy card with the air quality in Kumamoto now: it is refreshed every 15 minutes and links to this page. Paste the code into your site.

Air quality in Kumamoto now — Atmy

Japan · City ranking · All pilot cities

Questions

What was the air quality in Kumamoto over the last completed day?

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 6 µg/m³ from 8 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 5 of 43 cities in Japan and No. 608 of 676 worldwide, from the most polluted.

What is the air quality in Kumamoto right now?

Right now in Kumamoto, PM2.5 averages 12.0 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 8 sensors from Government stations, readings from 05:00–05:00 local time (20:00–20:00 UTC), summary prepared at 07:00 local time. Median: 12.0 µg/m³; range across sensors: 10.0–14.0 µg/m³.

Is it safe to be outdoors in Kumamoto now?

The current level is “moderate” (US EPA scale, approximate). Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. This is the standard guidance of the scale, not medical advice.

Where in Kumamoto is the air worse?

Highest current reading: 14.0 µg/m³ (水道町自排局 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市)). Lowest: 10.0 µg/m³ (北区役所 (環境省 大気汚染物質広域監視システム（そらまめくん） — 熊本市)). The list shows every sensor, highest first.

Where do these data come from?

From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.

How often is this page updated?

The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.

Data

Where do these data come from?

The daily value is the Data Hub’s: the mean of the city’s sensors that passed the nightly quality check, each with at least 12 valid hours, and only with sensors at four places 500 m apart; days are UTC.

“Now” uses the same sensors and rule: the mean of their latest readings, each at most 60 minutes old, shown only with sensors at four places 500 m apart reporting.

Source: public Atmy monitoring data. Methodology and data sources · Data terms