Air Quality in Koshigaya, Japan

Rain
22.8°C · 91.2% humidity
22.8°
Feels 22.8°
60
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
42 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
70 5am
70
69
60 8am
58
44
43 11am
42
42
41 2pm
41
41
52 5pm
52
52
52 8pm
52
69
70 11pm
70
132
132 2am
132
132
Station readings
10
CAMS model adj -14
84
84
83
66
66
54
54
54
54
54
54
54
66
66
66
66
66
83
84
84
146
146
146
146
AD 728×90

Air Quality Index Trend

6h · 1 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. Current PM2.5 concentration in Koshigaya is 1.1× the WHO 24-hour guideline of 15 µg/m³.

91.2%
Humidity
54.1 km/h
Wind N
1002.4 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
60
16.39 µg/m³
PM10
44
48.05 µg/m³
050100150200300500

What is the weather forecast for Koshigaya?

Temperature & Precipitation

PM2.5 Trend

6h · 1 station
PM2.516.39 µg/m³ ×1.1 WHO
Moderate
PM1048.05 µg/m³
Good
UV INDEX9.4
Very High
AD 300×250
Station readings (42 stations within 25 km)
16.39
Median
13.87
Average
1.4
Low
23.0
High
PM2.5 µg/m³ · Model: 23.15 · Bias: +6.8

What is the 7-day forecast for Koshigaya?

07-21
33.2° 22.0°
16.31 mm
07-22
30.2° 22.8°
5.87 mm
07-23
28.7° 21.6°
0.13 mm
07-24
29.9° 23.7°
1.0 mm
07-25
34.1° 23.2°
0.06 mm
07-26
31.9° 23.5°
0.94 mm
07-27
33.5° 24.5°
9.25 mm
Both models agree Avg diff: 3.4°C

Where are air quality stations near Koshigaya?

25
Higashikoshigaya, Koshigaya, Saitama, Japan (越谷市東越谷越谷市)
0.9 km PM2.5: 6.0 µg/m³
18
Higashikoshigaya, Koshigaya, Saitama, Japan (越谷市東越谷越谷市)
0.9 km PM2.5: 4.3 µg/m³
12
Sengendainishi, Koshigaya, Saitama Prefecture, Japan (越谷市千間台西越谷市)
5.2 km PM2.5: 2.9 µg/m³
58
Sengendainishi, Koshigaya, Saitama Prefecture, Japan (越谷市千間台西越谷市)
5.2 km PM2.5: 15.4 µg/m³
47
Hanaguri, Sōka-shi, Saitama-ken, Japan (草加市花栗自排草加市)
5.6 km PM2.5: 11.3 µg/m³
68
Sasakubo, Saitama, Japan (さいたま市城南さいたま市岩槻区)
6.2 km PM2.5: 20.2 µg/m³
49
Mashito, Kasukabe-shi, Saitama-ken, Japan (春日部増戸自排春日部市)
9.0 km PM2.5: 11.8 µg/m³
63
Mashito, Kasukabe-shi, Saitama-ken, Japan (春日部増戸自排春日部市)
9.0 km PM2.5: 17.8 µg/m³
18
Noda, Noda-shi, Chiba-ken, Japan (野田市野田野田市)
9.4 km PM2.5: 4.3 µg/m³
50
Noda, Noda-shi, Chiba-ken, Japan (野田市野田野田市)
9.4 km PM2.5: 12.0 µg/m³

What cities are near Koshigaya?

58 Matsubushi 57 Yoshikawa 22 Sōka 58 Hatogaya-honchō 74 Yashio 55 Toneri 48 Noda 54 Misato, Saitama 58 Takenotsuka 56 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 2026-07-21T23:16 UTC.