What is the air quality trend in Koshigaya?

Over the past 14 days, Koshigaya had an average AQI of 40 based on station measurements. The worst day was with AQI .

How is Koshigaya air quality measured?

Air quality in Koshigaya is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Koshigaya, Japan

Name: Koshigaya Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Koshigaya, Japan.

Current AQI
Good

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

262h · 8 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-11	49	28–60	12.6 µg/m³	18.3	19h	13
2026-04-10	41	18–64	10.2 µg/m³	17.1	24h	12
2026-04-09	31	13–41	7.5 µg/m³	13.2	18h	11
2026-04-08	36	27–44	8.5 µg/m³	10.0	9h	11
2026-04-07	29	7–63	7.2 µg/m³	10.9	24h	11
2026-04-06	53	42–62	13.4 µg/m³	19.9	18h	13
2026-04-04	39	19–59	9.8 µg/m³	15.6	15h	12
2026-04-03	36	27–55	8.7 µg/m³	11.9	24h	12
2026-04-02	18	6–32	4.3 µg/m³	6.1	24h	10
2026-04-01	17	7–30	4.2 µg/m³	5.9	23h	10
2026-03-31	26	5–41	6.2 µg/m³	10.7	24h	11
2026-03-30	43	24–113	12.4 µg/m³	18.6	11h	11
2026-03-29	65	49–75	18.6 µg/m³	25.3	24h	12
2026-03-28	82	52–119	26.4 µg/m³	34.7	5h	4

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