What is the air quality trend in Choi Wan Estate (I & II)?

Over the past 15 days, Choi Wan Estate (I & II) had an average AQI of 37 based on station measurements. The worst day was 2026-07-20 with AQI 61.

How is Choi Wan Estate (I & II) air quality measured?

Air quality in Choi Wan Estate (I & II) 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 Choi Wan Estate (I & II), Hong Kong

Name: Choi Wan Estate (I & II) Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Choi Wan Estate (I & II), Hong Kong.

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	59	54–71	15.8 µg/m³	17.9	5h	2
2026-07-21	60	40–76	16.5 µg/m³	18.6	24h	2
2026-07-20	61	28–77	17.5 µg/m³	18.5	24h	1
2026-07-19	48	5–78	12.5 µg/m³	14.1	24h	2
2026-07-18	41	18–54	9.8 µg/m³	11.4	24h	2
2026-07-17	41	23–56	9.8 µg/m³	11.4	24h	2
2026-07-16	20	4–49	4.8 µg/m³	5.7	24h	2
2026-07-15	27	9–57	6.5 µg/m³	7.7	24h	2
2026-07-14	13	1–125	3.8 µg/m³	4.6	23h	2
2026-07-13	15	1–50	3.6 µg/m³	4.0	24h	2
2026-07-12	51	21–70	13.7 µg/m³	15.4	24h	2
2026-07-11	37	22–56	9.1 µg/m³	9.7	24h	2
2026-07-10	24	9–33	5.7 µg/m³	6.6	24h	2
2026-07-09	28	19–44	6.7 µg/m³	7.6	24h	2
2026-07-08	40	21–65	9.8 µg/m³	10.7	18h	2

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