What is the air quality trend in Koshigaya?

Over the past 14 days, Koshigaya had an average AQI of 39 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

CSV JSON

Air Quality Index Trend

261h

PM2.5 Trend

261h · 8 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-18	40	32–54	9.6 µg/m³	14.1	11h	14
2026-04-17	37	25–46	8.9 µg/m³	12.6	16h	13
2026-04-16	30	25–42	7.2 µg/m³	10.1	24h	14
2026-04-15	35	24–48	8.4 µg/m³	12.5	24h	14
2026-04-14	55	44–63	14.0 µg/m³	21.4	24h	14
2026-04-13	51	30–59	12.7 µg/m³	20.3	17h	12
2026-04-12	46	32–52	11.0 µg/m³	16.2	24h	13
2026-04-11	46	28–60	11.8 µg/m³	17.2	24h	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	23	19–25	5.5 µg/m³	11.8	4h	11

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