What is the air quality trend in Hoàn Kiếm?

Over the past 15 days, Hoàn Kiếm had an average AQI of 57 based on station measurements. The worst day was 2026-07-21 with AQI 97.

How is Hoàn Kiếm air quality measured?

Air quality in Hoàn Kiếm 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 Hoàn Kiếm, Vietnam

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

Historical PM2.5 and AQI trend from monitoring stations near Hoàn Kiếm, Vietnam.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	86	56–120	28.5 µg/m³	32.3	8h	2
2026-07-21	97	75–130	33.4 µg/m³	39.4	24h	2
2026-07-20	71	15–128	23.1 µg/m³	27.9	24h	2
2026-07-19	34	10–69	8.7 µg/m³	10.7	24h	2
2026-07-18	18	8–58	4.3 µg/m³	6.8	24h	2
2026-07-17	21	9–48	5.0 µg/m³	7.7	24h	2
2026-07-16	37	16–70	9.5 µg/m³	12.1	24h	2
2026-07-15	61	44–93	17.2 µg/m³	21.2	24h	2
2026-07-14	59	48–74	16.0 µg/m³	18.0	24h	2
2026-07-13	63	18–118	19.2 µg/m³	22.6	24h	2
2026-07-12	56	14–80	15.4 µg/m³	18.9	24h	2
2026-07-11	90	72–104	30.7 µg/m³	39.2	24h	3
2026-07-10	57	12–90	16.7 µg/m³	20.7	24h	3
2026-07-09	46	19–86	12.3 µg/m³	14.3	23h	2
2026-07-08	73	19–140	22.9 µg/m³	27.9	15h	2

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