What is the air quality trend in Tachiarai?

Over the past 8 days, Tachiarai had an average AQI of 44 based on station measurements. The worst day was 2026-10-16 with AQI 55.

How is Tachiarai air quality measured?

Air quality in Tachiarai 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 Tachiarai, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 20 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	36	30–45	8.5 µg/m³	11h	23
2026-10-20	40	22–56	9.6 µg/m³	24h	22
2026-10-19	42	28–77	10.3 µg/m³	24h	23
2026-10-18	37	27–60	8.9 µg/m³	24h	24
2026-10-17	52	32–123	13.9 µg/m³	24h	22
2026-10-16	55	33–96	15.0 µg/m³	24h	21
2026-10-15	46	26–126	11.9 µg/m³	24h	22
2026-10-14	50	25–131	13.7 µg/m³	10h	21

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