What is the air quality trend in Shōwa?

Over the past 15 days, Shōwa had an average AQI of 37 based on station measurements. The worst day was 2026-10-11 with AQI 50.

How is Shōwa air quality measured?

Air quality in Shōwa 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 Shōwa, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

332h

PM2.5 Station

332h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	26	9–46	6.3 µg/m³	12h	4
2026-10-20	36	14–53	8.6 µg/m³	24h	4
2026-10-19	37	19–62	9.0 µg/m³	23h	4
2026-10-18	29	16–57	7.0 µg/m³	24h	4
2026-10-17	41	28–70	10.2 µg/m³	24h	4
2026-10-16	48	27–113	12.5 µg/m³	24h	3
2026-10-15	31	18–52	7.5 µg/m³	24h	3
2026-10-14	31	8–64	7.8 µg/m³	24h	3
2026-10-13	42	23–88	10.5 µg/m³	24h	3
2026-10-12	40	25–60	9.7 µg/m³	24h	4
2026-10-11	50	21–174	15.2 µg/m³	24h	3
2026-10-10	40	18–62	9.8 µg/m³	24h	3
2026-10-09	41	20–71	10.1 µg/m³	23h	3
2026-10-08	39	17–56	9.4 µg/m³	24h	4
2026-10-07	28	17–42	6.8 µg/m³	10h	4

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