What is the air quality in Koshigaya today?

The current Air Quality Index (AQI) in Koshigaya is 19 (Good). PM2.5 concentration is 4.52 µg/m³.

What is the temperature in Koshigaya right now?

The current temperature in Koshigaya is 15.8°C (feels like 15.8°C). Humidity is 74.9% and wind speed is 26.7 km/h.

Is it safe to go outside in Koshigaya?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Koshigaya, Japan

Drizzle

15.8°C · 74.9% humidity

15.8°

Feels 15.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

36 stations

Nearby Monitoring Stations

AQI Forecast

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Station readings 7h ago

AQI 69

PM2.5 20.6 µg/m³ · 7h ago

Air Quality Index Trend

40h · 1 stn

View full history →

Koshigaya's air quality is influenced by industrial emissions, vehicle traffic, and regional pollution transport. Winter heating season and spring dust events typically create the most challenging air quality conditions.

74.9%

Humidity

26.7 km/h

Wind NNE

1021.7 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.52 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Koshigaya?

Temperature & Precipitation

PM2.5 Trend

40h · 1 station

PM2.54.52 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (36 stations within 25 km)

4.52

Median

8.09

Average

2.9

Low

32.1

High

PM2.5 µg/m³ · Model: 5.8 · Bias: +1.3

What is the 7-day forecast for Koshigaya?

10-21

22.1° 15.8°

0.69 mm

10-22

23.6° 17.5°

0.38 mm

10-23

22.8° 15.6°

10-24

22.1° 17.4°

0.13 mm

10-25

19.8° 14.4°

6.25 mm

10-26

21.2° 14.8°

0.06 mm

10-27

19.8° 15.1°

0.75 mm

Both models agree Avg diff: 3.1°C

Where are air quality stations near Koshigaya?

Higashikoshigaya, Koshigaya, Saitama, Japan (越谷市東越谷越谷市)

0.9 km PM2.5: 4.1 µg/m³

Sasakubo, Saitama, Japan (さいたま市城南さいたま市岩槻区)

6.2 km PM2.5: 5.3 µg/m³

Sasakubo, Saitama, Japan (さいたま市城南さいたま市岩槻区)

6.2 km PM2.5: 5.0 µg/m³

Chuo, Yashio, Saitama, Japan (八潮八潮市)

8.8 km PM2.5: 8.2 µg/m³

Chuo, Yashio, Saitama, Japan (八潮八潮市)

8.8 km PM2.5: 7.2 µg/m³

Noda, Noda-shi, Chiba-ken, Japan (野田市野田野田市)

9.4 km PM2.5: 9.1 µg/m³

Mikura, Saitama, Japan (さいたま市片柳さいたま市見沼区)

10.6 km PM2.5: 4.1 µg/m³

Heiwadai, Nagareyama-shi, Chiba-ken, Japan (流山平和台流山市)

10.9 km PM2.5: 9.1 µg/m³

Shibahinotsume, Kawaguchi, Saitama, Japan (川口市芝川口市)

11.2 km PM2.5: 4.1 µg/m³

Chūōhonchō, Adachi-ku, Tōkyō-to, Japan (日光街道梅島足立区)

13.2 km PM2.5: 6.0 µg/m³

What cities are near Koshigaya?

26 Matsubushi 31 Yoshikawa 30 Sōka 29 Hatogaya-honchō 21 Yashio 30 Toneri 38 Noda 38 Misato, Saitama 32 Takenotsuka 38 Nagareyama

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-21T06:03 UTC.