What is the air quality trend in Niigata?

Over the past 14 days, Niigata had an average AQI of 43 based on station measurements. The worst day was 2026-07-16 with AQI 57.

How is Niigata air quality measured?

Air quality in Niigata 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 Niigata, Japan

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

303h

PM2.5 Station

303h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	51	26–66	13.2 µg/m³	16h	3
2026-07-20	52	38–78	13.6 µg/m³	22h	3
2026-07-19	47	13–103	12.7 µg/m³	22h	3
2026-07-18	41	9–89	11.2 µg/m³	22h	3
2026-07-17	49	28–71	12.6 µg/m³	22h	2
2026-07-16	57	18–91	15.8 µg/m³	23h	2
2026-07-15	49	20–71	12.6 µg/m³	23h	3
2026-07-14	46	15–58	11.3 µg/m³	20h	3
2026-07-13	43	12–66	10.8 µg/m³	24h	3
2026-07-12	39	6–63	9.6 µg/m³	22h	3
2026-07-11	33	17–57	8.0 µg/m³	24h	2
2026-07-10	32	13–63	8.0 µg/m³	21h	3
2026-07-09	34	13–64	8.3 µg/m³	22h	3
2026-07-08	33	15–57	8.0 µg/m³	20h	3

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