Yokohama air quality now

Japan · The summary is refreshed every 15 minutes.

November 12

The air is moderate now

Measured 05:00

Yokohama

9°C

Partly cloudy

53AQI

1029

hPa

Atmospheric
pressure

77%

Humidity

Yokohama, November 10, 2026: daily mean PM2.5 4 µg/m³ (14 sensors), level “Low” — as in the Atmy Data Hub. Now (07:00 local time): 10.0 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in Yokohama, PM2.5 averages 10.0 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 14 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: 10.0 µg/m³; range across sensors: 6.0–13.0 µg/m³.

In Yokohama the air is moderate 🟡 AQI 53. Higher than three hours ago. ⛅ +9 °C · No precipitation · Wind 2 m/s

In Yokohama 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 10.4 to 10.0 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).

Weather now: partly cloudy, 9°C, wind 2 m/s, humidity 77%. No major change in the wind is expected in the coming hours. By 18:00 the temperature will be about 16°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, NNW

0 mm

Precipitation today

Yokohama: 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

4 µg/m³ Low

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 4 µg/m³ from 14 sensors that passed the quality check — the same value as in the Atmy Data Hub.

No. 22 of 43 cities in Japan and No. 636 of 676 worldwide, from the most polluted.

LowModerateElevatedHighVery highExtremely high

Pollution accumulation index now

40/100Moderate · An estimate of weather conditions · not a PM2.5 forecast

Now4043
07.0015.0022.0006.00

Pollution accumulation forecast

Today — November 12

18°/9°

Index by time of day

53/100Moderate

  1. 53/100Night
  2. 40/100Morning
  3. 9/100Day
  4. 22/100Evening

Friday — November 13

21°/10°

Index by time of day

56/100Moderate

  1. 56/100Night
  2. 43/100Morning
  3. 9/100Day
  4. 24/100Evening

Saturday — November 14

19°/11°

Index by time of day

55/100Moderate

  1. 55/100Night
  2. 42/100Morning
  3. 9/100Day
  4. 21/100Evening

Sunday — November 15

17°/12°

Index by time of day

51/100Moderate

  1. 51/100Night
  2. 39/100Morning
  3. 8/100Day
  4. 20/100Evening

Monday — November 16

19°/12°

Index by time of day

43/100Moderate

  1. 43/100Night
  2. 30/100Morning
  3. 7/100Day
  4. 20/100Evening

Tuesday — November 17

14°/11°

Index by time of day

39/100Moderate

  1. 39/100Night
  2. 31/100Morning
  3. 7/100Day
  4. 19/100Evening

Forecast of conditions that trap pollution near the surface

Weather

9°

Partly cloudy. Feels like 7°C

  1. MorningClear11°C67%
  2. DayClear18°C63%
  3. EveningClear15°C75%

Wind

2m/sWind from the NNW

5m/sWind gusts

Wind force: 2

Gusts up to 5 m/s are expected.

10-day weather forecast for Yokohama

Japan

  1. TodayNov 12Partly cloudy18°C9°C
  2. FriNov 13Partly cloudy21°C10°C
  3. SatNov 14Partly cloudy19°C11°C
  4. SunNov 15Rain17°C12°C
  5. MonNov 16Rain19°C12°C
  6. TueNov 17Rain14°C11°C
  7. WedNov 18Rain20°C10°C
  8. ThuNov 19Clear18°C9°C
  9. FriNov 20Clear14°C7°C
  10. SatNov 21Clear16°C6°C

Where in Yokohama is the air worse?

See all sensors

Highest current reading: 13.0 µg/m³ (中区本牧大里町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市)). Lowest: 6.0 µg/m³ (鶴見区本町通 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市)). The list shows every sensor, highest first.

  1. 中区本牧大里町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →13 µg/m³
  2. 緑区三保町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →11 µg/m³
  3. 都筑区茅ケ崎中央 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →11 µg/m³
  4. 保土ケ谷区桜ケ丘 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →11 µg/m³
  5. 青葉区市ケ尾町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →11 µg/m³
  6. 金沢区富岡東 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →10 µg/m³
  7. 港北区大豆戸町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →10 µg/m³
  8. 旭区鶴ケ峰 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →10 µg/m³
  9. 戸塚区戸塚町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →10 µg/m³
  10. 西区平沼 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →10 µg/m³
+4 more sensors
  1. 神奈川区広台太田町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →10 µg/m³
  2. 瀬谷区南瀬谷 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →9 µg/m³
  3. 泉区和泉中央北 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →8 µg/m³
  4. 鶴見区本町通 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市) →6 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: Government stations — 14 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: Yokohama

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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Air quality in Yokohama now — Atmy

Japan · City ranking · All pilot cities

Questions

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

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 09:00–09:00 UTC+9): 4 µg/m³ from 14 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 22 of 43 cities in Japan and No. 636 of 676 worldwide, from the most polluted.

What is the air quality in Yokohama right now?

Right now in Yokohama, PM2.5 averages 10.0 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 14 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: 10.0 µg/m³; range across sensors: 6.0–13.0 µg/m³.

Is it safe to be outdoors in Yokohama 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 Yokohama is the air worse?

Highest current reading: 13.0 µg/m³ (中区本牧大里町 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市)). Lowest: 6.0 µg/m³ (鶴見区本町通 (環境省 大気汚染物質広域監視システム（そらまめくん） — 横浜市)). 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