What is the air quality trend in Okayama?

Over the past 15 days, Okayama had an average AQI of 37 based on station measurements. The worst day was 2026-05-16 with AQI 51.

How is Okayama air quality measured?

Air quality in Okayama 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 Okayama, Japan

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

330h

PM2.5 Station

330h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	49	39–71	12.5 µg/m³	6h	19
2026-05-29	36	25–47	8.6 µg/m³	24h	22
2026-05-28	31	25–40	7.5 µg/m³	24h	21
2026-05-27	34	23–44	8.1 µg/m³	24h	22
2026-05-26	34	23–48	8.3 µg/m³	24h	21
2026-05-25	34	25–43	8.3 µg/m³	24h	22
2026-05-24	38	27–53	9.1 µg/m³	24h	22
2026-05-23	35	28–45	8.4 µg/m³	24h	22
2026-05-22	30	24–37	7.3 µg/m³	24h	23
2026-05-21	30	20–40	7.1 µg/m³	24h	21
2026-05-20	34	26–41	8.2 µg/m³	24h	22
2026-05-19	36	28–54	8.8 µg/m³	24h	22
2026-05-18	46	40–54	11.2 µg/m³	24h	22
2026-05-17	40	30–50	9.6 µg/m³	22h	22
2026-05-16	51	39–58	12.7 µg/m³	14h	22

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