SmogRank / Singapore / Queenstown Estate

Queenstown Estate, month by month

Queenstown Estate has a measured daily mean on 810 days since 11 January 2023. Its worst month was September 2026, at 124 US AQI (44.8 µg/m³), 37th of 2,997 cities on that month's world ranking. Its cleanest was December 2023, at 43 US AQI (7.7 µg/m³). 2024 averaged 54 US AQI (10.6 µg/m³), against 56 US AQI (12.0 µg/m³) in 2023.

Every month since 2023

2026too few days for a mean (a year needs 200)127 days measured
Jan61#774Feb16 daysMar69#649Apr2 daysMay6 daysJun4 daysJul4 daysAug8 daysSep124#37Oct170#4
2025too few days for a mean (a year needs 256)65 days measured
Jan6 daysFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSep4 daysOct16 daysNov62#584Dec17 days
202454 for the year352 days measured503rd of 2,097 in the world
Jan51#1,007Feb56#506Mar55#284Apr51#1,150May47#1,130Jun52#752Jul59#257Aug55#433Sep57#268Oct58#345Nov52#927Dec48#1,188
202356 for the year266 days measured217th of 1,355 in the world
Jan14 daysFeb2 daysMar8 daysApr18 daysMay54#383Jun53#756Jul54#585Aug57#301Sep64#151Oct71#67Nov54#485Dec43#1,346
Each square is a month's mean PM2.5 in US AQI from Queenstown Estate'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 Queenstown Estate marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Unhealthy for 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

21 months
MonthWhy
Aug 20268 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Jul 20264 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Jun 20264 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
May 20266 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Apr 20262 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Feb 202616 of 28 days measured; a month needs 20. The others: 12 with under 18 hours of readings or readings that failed our checks.
Dec 202517 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Oct 202516 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Sep 20254 of 30 days measured; a month needs 21. The others: 3 with readings for part of the day (a day needs 18 hours), 23 with under 18 hours of readings or readings that failed our checks.
Aug 2025No day measured. The others: 6 with readings for part of the day (a day needs 18 hours), 25 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 13 with readings for part of the day (a day needs 18 hours), 18 with under 18 hours of readings or readings that failed our checks.
Jun 2025No day measured. The others: 22 with readings for part of the day (a day needs 18 hours), 8 with under 18 hours of readings or readings that failed our checks.
May 2025No day measured. The others: 28 with readings for part of the day (a day needs 18 hours), 3 with under 18 hours of readings or readings that failed our checks.
Apr 2025No day measured. The others: 12 with readings for part of the day (a day needs 18 hours), 18 with under 18 hours of readings or readings that failed our checks.
Mar 2025No day measured. The others: 11 with readings for part of the day (a day needs 18 hours), 20 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 12 with readings for part of the day (a day needs 18 hours), 16 with under 18 hours of readings or readings that failed our checks.
Jan 20256 of 31 days measured; a month needs 22. The others: 12 with readings for part of the day (a day needs 18 hours), 13 with under 18 hours of readings or readings that failed our checks.
Apr 202318 of 30 days measured; a month needs 21. The others: 5 with no readings from the monitors, 5 with readings for part of the day (a day needs 18 hours), 2 missing from OpenAQ's archive.
Mar 20238 of 31 days measured; a month needs 22. The others: 4 with readings for part of the day (a day needs 18 hours), 19 missing from OpenAQ's archive.
Feb 20232 of 28 days measured; a month needs 20. The others: 1 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive.
Jan 202314 of 31 days measured; a month needs 22. The others: 1 with readings for part of the day (a day needs 18 hours), 6 missing from OpenAQ's archive.

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

Queenstown Estate's worst months

MonthUS AQIDays measuredWorld rank
September 2026 12444.8 µg/m³26 of 3037thof 2,997
October 2023 7119.8 µg/m³25 of 3167thof 2,012
March 2026 6918.6 µg/m³24 of 31649thof 2,971
September 2023 6416.2 µg/m³30 of 30151stof 2,176
November 2025 6215.1 µg/m³22 of 30584thof 2,715
January 2026 6114.7 µg/m³25 of 31774thof 2,617

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.

Queenstown Estate's worst days

DayUS AQI
9 Oct 2026 194117.0 µg/m³
10 Oct 2026 192114.3 µg/m³
12 Oct 2026 189109.0 µg/m³
7 Oct 2026 186106.0 µg/m³
8 Oct 2026 17589.8 µg/m³
11 Oct 2026 17488.4 µg/m³
29 Sept 2026 17487.6 µg/m³
5 Oct 2026 17285.4 µg/m³
6 Oct 2026 17082.1 µg/m³
14 Sept 2026 16981.4 µg/m³

Daily means, the highest since 11 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, Queenstown Estate, Singapore, 11 Jan 2023 – 12 Oct 2026. Monitor data from Clarity and AirGradient via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/sg/queenstown-estate/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.

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

Updated 2026-10-13 04:07 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).