Air Quality in Koshigaya, Japan

Cloudy
25.7°C · 73.3% humidity
25.7°
Feels 25.7°
33
Good
Air quality is satisfactory. Enjoy outdoor activities.
13 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
27 1pm
27
27
33 4pm
31
30
29 7pm
29
40
28 10pm
28
27
27 1am
27
27
27 4am
27
27
7 7am
7
7
7 10am
7
7
Station readings 6h ago
AQI 19
PM2.5 4.5 µg/m³ · 6h ago
CAMS model adj -27
54
54
54
54
54
54
54
54
66
54
54
54
54
54
54
54
54
54
34
34
34
34
34
34
AD 728×90

Air Quality Index Trend

15h · 2 stn

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.

73.3%
Humidity
29.7 km/h
Wind E
1009.5 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
33
7.88 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Koshigaya?

Temperature & Precipitation

PM2.5 Trend

15h · 2 stations
PM2.57.88 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX4.4
Moderate
AD 300×250
Station readings (13 stations within 25 km)
7.88
Median
6.96
Average
3.6
Low
14.0
High
PM2.5 µg/m³ · Model: 8.2 · Bias: +0.3

What is the 7-day forecast for Koshigaya?

08-03
28.4° 22.0°
11.69 mm
08-04
35.2° 25.3°
5.25 mm
08-05
32.9° 25.2°
3.56 mm
08-06
31.0° 26.5°
13.88 mm
08-07
36.6° 24.8°
13.31 mm
08-08
33.4° 27.0°
45.63 mm
08-09
34.6° 22.7°
0.19 mm
Both models agree Avg diff: 3.3°C

Where are air quality stations near Koshigaya?

4
Sengendainishi, Koshigaya, Saitama Prefecture, Japan (越谷市千間台西越谷市)
5.2 km PM2.5: 1.0 µg/m³
21
Chuo, Yashio, Saitama, Japan (八潮八潮市)
8.8 km PM2.5: 5.0 µg/m³
57
Noda, Noda-shi, Chiba-ken, Japan (野田市野田野田市)
9.4 km PM2.5: 15.0 µg/m³
34
Noda, Noda-shi, Chiba-ken, Japan (野田市野田野田市)
9.4 km PM2.5: 8.2 µg/m³
14
Mikura, Saitama, Japan (さいたま市片柳さいたま市見沼区)
10.6 km PM2.5: 3.4 µg/m³
25
Mikura, Saitama, Japan (さいたま市片柳さいたま市見沼区)
10.6 km PM2.5: 6.0 µg/m³
25
Heiwadai, Nagareyama-shi, Chiba-ken, Japan (流山平和台流山市)
10.9 km PM2.5: 6.0 µg/m³
25
Heiwadai, Nagareyama-shi, Chiba-ken, Japan (流山平和台流山市)
10.9 km PM2.5: 6.0 µg/m³
10
Nishiarai, Adachi, Tokyo, Japan (足立区西新井足立区)
12.5 km PM2.5: 2.4 µg/m³
34
Mizumotokoen, Katsushika, Tokyo, Japan (葛飾区水元公園葛飾区)
13.6 km PM2.5: 8.2 µg/m³

What cities are near Koshigaya?

31 Matsubushi 27 Yoshikawa 28 Sōka 32 Hatogaya-honchō 27 Yashio 28 Toneri 21 Noda 25 Misato, Saitama 27 Takenotsuka 25 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 2026-08-08T07:24 UTC.