What is the air quality trend in Ōarai?

Over the past 20 days, Ōarai had an average AQI of 38 based on station measurements. The worst day was 2026-05-18 with AQI 56.

How is Ōarai air quality measured?

Air quality in Ōarai 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 Ōarai, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

464h

PM2.5 Station

464h · 4 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	34	17–55	8.2 µg/m³	21h	3
2026-05-28	35	19–53	8.4 µg/m³	24h	4
2026-05-27	25	9–47	6.1 µg/m³	23h	4
2026-05-26	28	11–52	6.8 µg/m³	23h	3
2026-05-25	36	22–53	8.6 µg/m³	24h	4
2026-05-24	32	16–70	7.9 µg/m³	24h	4
2026-05-23	30	10–53	7.3 µg/m³	24h	4
2026-05-22	28	13–52	6.7 µg/m³	24h	4
2026-05-21	30	9–57	7.2 µg/m³	24h	2
2026-05-20	39	18–58	9.6 µg/m³	24h	4
2026-05-19	37	17–61	9.0 µg/m³	24h	4
2026-05-18	56	42–68	14.5 µg/m³	24h	4
2026-05-17	48	24–65	12.0 µg/m³	23h	4
2026-05-16	53	30–65	13.7 µg/m³	20h	3
2026-05-15	53	30–66	13.6 µg/m³	23h	3
2026-05-14	53	39–80	13.5 µg/m³	22h	3
2026-05-13	36	13–68	8.9 µg/m³	24h	3
2026-05-12	33	5–50	7.9 µg/m³	24h	3
2026-05-11	40	9–72	10.2 µg/m³	23h	3
2026-05-10	44	25–83	11.1 µg/m³	22h	3

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