SmogRank / Hong Kong / Central and Western / Victoria

Victoria, month by month

Victoria, Central and Western has a measured daily mean on 1,103 days since 1 January 2023. Its worst month was December 2024, at 87 US AQI (28.6 µg/m³), 105th of 2,616 cities on that month's world ranking. Its cleanest was July 2024, at 25 US AQI (4.5 µg/m³). 2025 averaged 60 US AQI (13.7 µg/m³), against 61 US AQI (14.2 µg/m³) in 2024.

Every month since 2023

202662 so far214 days measured564th of 2,798 in the world

Jan80#254 Feb71#567 Mar64#757 Apr61#604 May53#707JunnoneJul2 daysAug53#895 Sep57#479 Oct55#534

202560 for the year356 days measured484th of 2,681 in the world

Jan78#206 Feb68#677 Mar62#934 Apr71#353 May55#649 Jun28#2,287 Jul44#1,800 Aug34#2,450 Sep29#2,508 Oct54#510 Nov64#538 Dec78#398

202461 for the year339 days measured283rd of 2,097 in the world

Jan85#140 Feb63#316Mar19 daysApr57#689 May55#552 Jun33#2,051 Jul25#2,368 Aug48#998 Sep52#462 Oct62#264 Nov59#478 Dec87#105

2023too few days for a mean (a year needs 256)194 days measured

Jan19 daysFeb1 dayMar6 daysApr16 daysMay14 daysJun14 daysJul15 daysAug36#1,529Sep20 daysOct11 daysNov65#121 Dec75#125

Each square is a month's mean PM2.5 in US AQI from Victoria's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Victoria marked; each year, the year's. A dashed square is the running month, so far.

Good0–50

Moderate51–100

Sensitive groups101–150

Unhealthy151–200

Very unhealthy201–300

Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Months without a mean, and why

12 months

Month	Why
Jul 2026	2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Jun 2026	No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2024	19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Oct 2023	11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Sep 2023	20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jul 2023	15 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 15 with under 18 hours of readings or readings that failed our checks.
Jun 2023	14 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
May 2023	14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Apr 2023	16 of 30 days measured; a month needs 21. The others: 2 missing from OpenAQ's archive, 12 with under 18 hours of readings or readings that failed our checks.
Mar 2023	6 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 5 with under 18 hours of readings or readings that failed our checks.
Feb 2023	1 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 2 with under 18 hours of readings or readings that failed our checks.
Jan 2023	19 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 6 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Victoria's worst months

Month	US AQI	Days measured	World rank
December 2024	8728.6 µg/m³	30 of 31	105thof 2,616
January 2024	8527.1 µg/m³	30 of 31	140thof 2,385
January 2026	8024.7 µg/m³	28 of 31	254thof 2,617
January 2025	7823.4 µg/m³	31 of 31	206thof 2,474
December 2025	7823.4 µg/m³	31 of 31	398thof 3,006
December 2023	7522.0 µg/m³	29 of 31	125thof 2,247

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Victoria's worst days

Day	US AQI
14 Apr 2025	16676.5 µg/m³
13 Apr 2025	15358.2 µg/m³
1 Jan 2024	13951.0 µg/m³
30 Dec 2025	13248.1 µg/m³
15 Apr 2025	13247.9 µg/m³
29 Dec 2024	13047.1 µg/m³
16 Feb 2025	12645.6 µg/m³
2 Jan 2025	12545.2 µg/m³
13 Jan 2026	12545.2 µg/m³
31 Dec 2023	12244.1 µg/m³

Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Victoria, Central and Western, Hong Kong, 1 Jan 2023 – 12 Oct 2026. Monitor data from Hong Kong's Environmental Protection Department via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/hk/victoria/history (accessed 13 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Victoria now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-13 02:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).