What is the air quality trend in Hạ Long?

Over the past 8 days, Hạ Long had an average AQI of 68 based on station measurements. The worst day was 2026-09-04 with AQI 86.

How is Hạ Long air quality measured?

Air quality in Hạ Long 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 Hạ Long, Vietnam

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

Historical PM2.5 and AQI trend from monitoring stations near Hạ Long, Vietnam.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

153h

PM2.5 Station

153h · 3 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	69	21–171	23.2 µg/m³	18h	3
2026-09-04	86	30–190	33.8 µg/m³	22h	3
2026-09-03	79	5–253	31.9 µg/m³	20h	3
2026-09-02	79	23–284	32.9 µg/m³	24h	2
2026-09-01	56	14–185	18.1 µg/m³	24h	3
2026-08-31	50	20–159	14.5 µg/m³	24h	3
2026-08-30	65	31–160	19.8 µg/m³	20h	3
2026-08-29	66	66–66	19.0 µg/m³	1h	3

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