Air Quality in Koshigaya, Japan

Drizzle
23.9°C · 79.5% humidity
23.9°
Feels 23.9°
22
Good
Air quality is satisfactory. Enjoy outdoor activities.
53 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
20 4pm
20
20
22 7pm
20
20
20 10pm
20
20
20 1am
18
18
18 4am
18
18
18 7am
20
20
20 10am
27
27
27 1pm
47
47
Station readings
13
11
35
CAMS model adj -7
27
27
27
27
27
27
27
27
27
27
25
25
25
25
25
25
27
27
27
34
34
34
54
54
AD 728×90

Air Quality Index Trend

40h · 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.

79.5%
Humidity
41.9 km/h
Wind ENE
1010.2 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
22
5.23 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Koshigaya?

Temperature & Precipitation

PM2.5 Trend

40h · 1 station
PM2.55.23 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (53 stations within 25 km)
5.23
Median
5.99
Average
1.2
Low
12.0
High
PM2.5 µg/m³ · Model: 6.15 · Bias: +0.9

What is the 7-day forecast for Koshigaya?

09-05
28.0° 20.8°
15.38 mm
09-06
30.9° 23.1°
1.75 mm
09-07
32.4° 23.3°
0.06 mm
09-08
31.1° 22.6°
3.94 mm
09-09
28.2° 22.4°
5.87 mm
09-10
29.3° 23.2°
4.19 mm
09-11
32.4° 24.1°
0.5 mm
Both models agree Avg diff: 4.0°C

Where are air quality stations near Koshigaya?

4
Hanaguri, Sōka-shi, Saitama-ken, Japan (草加市花栗自排草加市)
5.6 km PM2.5: 1.0 µg/m³
13
Chuo, Yashio, Saitama, Japan (八潮八潮市)
8.8 km PM2.5: 3.1 µg/m³
17
Chuo, Yashio, Saitama, Japan (八潮八潮市)
8.8 km PM2.5: 4.1 µg/m³
30
Mashito, Kasukabe-shi, Saitama-ken, Japan (春日部増戸自排春日部市)
9.0 km PM2.5: 7.2 µg/m³
30
Noda, Noda-shi, Chiba-ken, Japan (野田市野田野田市)
9.4 km PM2.5: 7.2 µg/m³
9
Misato, Misato-shi, Saitama-ken, Japan (三郷三郷市)
9.8 km PM2.5: 2.2 µg/m³
34
Miyazaki, Noda, Chiba, Japan (国設野田自動車交通環境測定野田市)
9.8 km PM2.5: 8.2 µg/m³
25
Miyazaki, Noda, Chiba, Japan (国設野田自動車交通環境測定野田市)
9.8 km PM2.5: 6.0 µg/m³
34
Yahara, Kasukabe-shi, Saitama-ken, Japan (春日部春日部市)
9.9 km PM2.5: 8.2 µg/m³
13
Kawaguchi (川口)
10.9 km PM2.5: 3.1 µg/m³

What cities are near Koshigaya?

23 Matsubushi 21 Yoshikawa 15 Sōka 20 Hatogaya-honchō 17 Yashio 21 Toneri 25 Noda 13 Misato, Saitama 23 Takenotsuka 5 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 2026-09-05T10:27 UTC.