SmogRank / Hong Kong / Yau Tsim Mong District

Air quality in Mong Kok

Yau Tsim Mong District, Hong Kong. PM2.5 from 1 reference monitor, updated hourly.

– µg/m³

No reading in the last few days.

Rank

24 h
–
not enough data
7 days
#391
of 2,330 · 11.6 µg/m³
30 days
#237
of 2,327 · 14.7 µg/m³
Year
#283
of 2,160 · 16.3 µg/m³

Why it ranks here

Seasonal. Over the past year its worst months were January, February, December, averaging up to 26.2 µg/m³ against 11.6 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Mong Kok's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

Last 0 days, hour by hour

No hourly readings yet.

Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 8.5 µg/m³2025-09-30: 9.5 µg/m³2025-10-01: 9.1 µg/m³2025-10-02: 8.8 µg/m³2025-10-03: 7.0 µg/m³2025-10-04: 8.2 µg/m³2025-10-05: 8.2 µg/m³2025-10-06: 7.5 µg/m³2025-10-07: 9.8 µg/m³2025-10-08: 12.1 µg/m³2025-10-09: 16.2 µg/m³2025-10-10: 14.9 µg/m³2025-10-11: 11.8 µg/m³2025-10-12: 8.4 µg/m³2025-10-13: 6.9 µg/m³2025-10-14: 7.0 µg/m³2025-10-15: 10.0 µg/m³2025-10-16: 12.4 µg/m³2025-10-17: 16.8 µg/m³2025-10-18: 18.5 µg/m³2025-10-19: 16.4 µg/m³2025-10-20: 11.0 µg/m³2025-10-21: 3.4 µg/m³2025-10-22: 4.4 µg/m³2025-10-23: 11.0 µg/m³2025-10-24: 17.7 µg/m³2025-10-25: 17.6 µg/m³2025-10-26: 20.2 µg/m³2025-10-27: 32.3 µg/m³2025-10-28: 28.8 µg/m³2025-10-29: 14.7 µg/m³2025-10-30: 17.8 µg/m³2025-10-31: 16.7 µg/m³2025-11-01: 18.0 µg/m³2025-11-02: 23.7 µg/m³2025-11-03: 23.7 µg/m³2025-11-04: 16.2 µg/m³2025-11-05: 8.3 µg/m³2025-11-06: 14.1 µg/m³2025-11-07: 14.9 µg/m³2025-11-08: 16.2 µg/m³2025-11-09: 17.7 µg/m³2025-11-10: 10.5 µg/m³2025-11-11: 11.0 µg/m³2025-11-12: 14.4 µg/m³2025-11-13: 8.3 µg/m³2025-11-14: 10.4 µg/m³2025-11-15: 18.9 µg/m³2025-11-16: 19.9 µg/m³2025-11-17: 21.1 µg/m³2025-11-18: 24.2 µg/m³2025-11-19: 10.0 µg/m³2025-11-20: 13.2 µg/m³2025-11-21: 15.5 µg/m³2025-11-22: 20.1 µg/m³2025-11-23: 31.7 µg/m³2025-11-24: 30.7 µg/m³2025-11-25: 20.1 µg/m³2025-11-26: 26.2 µg/m³2025-11-27: 17.0 µg/m³2025-11-28: 21.3 µg/m³2025-11-29: 29.8 µg/m³2025-11-30: 23.1 µg/m³2025-12-01: 17.4 µg/m³2025-12-02: 16.3 µg/m³2025-12-03: 30.9 µg/m³2025-12-04: 43.5 µg/m³2025-12-05: 35.2 µg/m³2025-12-06: 31.9 µg/m³2025-12-07: 33.1 µg/m³2025-12-08: 28.3 µg/m³2025-12-09: 27.1 µg/m³2025-12-10: 26.6 µg/m³2025-12-11: 29.1 µg/m³2025-12-12: 25.8 µg/m³2025-12-13: 22.2 µg/m³2025-12-14: 10.4 µg/m³2025-12-15: 18.2 µg/m³2025-12-16: 27.3 µg/m³2025-12-17: 34.1 µg/m³2025-12-18: 30.2 µg/m³2025-12-19: 25.5 µg/m³2025-12-20: 11.5 µg/m³2025-12-21: 28.5 µg/m³2025-12-22: 33.7 µg/m³2025-12-23: 17.5 µg/m³2025-12-24: 29.2 µg/m³2025-12-25: 15.7 µg/m³2025-12-26: 16.0 µg/m³2025-12-27: 28.4 µg/m³2025-12-28: 24.0 µg/m³2025-12-29: 23.5 µg/m³2025-12-30: 48.9 µg/m³2025-12-31: 20.8 µg/m³2026-01-01: 22.8 µg/m³2026-01-02: 13.8 µg/m³2026-01-03: 16.6 µg/m³2026-01-04: 20.7 µg/m³2026-01-05: 25.7 µg/m³2026-01-06: 18.8 µg/m³2026-01-07: 25.5 µg/m³2026-01-08: 15.3 µg/m³2026-01-09: 19.2 µg/m³2026-01-10: 23.4 µg/m³2026-01-11: 17.3 µg/m³2026-01-12: 30.7 µg/m³2026-01-13: 48.9 µg/m³2026-01-14: 25.7 µg/m³2026-01-15: 33.4 µg/m³2026-01-16: 29.9 µg/m³2026-01-17: 24.6 µg/m³2026-01-18: 23.8 µg/m³2026-01-19: 29.8 µg/m³2026-01-20: 15.6 µg/m³2026-01-21: 28.9 µg/m³2026-01-22: 23.7 µg/m³2026-01-23: 32.5 µg/m³2026-01-24: 43.1 µg/m³2026-01-25: 18.8 µg/m³2026-01-26: 14.4 µg/m³2026-01-27: 40.0 µg/m³2026-01-28: 32.4 µg/m³2026-01-29: 24.4 µg/m³2026-01-30: 17.5 µg/m³2026-01-31: 13.1 µg/m³2026-02-01: 13.0 µg/m³2026-02-02: 18.8 µg/m³2026-02-03: 25.5 µg/m³2026-02-04: 31.9 µg/m³2026-02-05: 27.1 µg/m³2026-02-06: 17.8 µg/m³2026-02-07: 25.0 µg/m³2026-02-08: 14.2 µg/m³2026-02-09: 19.2 µg/m³2026-02-10: 19.0 µg/m³2026-02-11: 15.9 µg/m³2026-02-12: 24.2 µg/m³2026-02-13: 24.5 µg/m³2026-02-14: 21.6 µg/m³2026-02-15: 13.2 µg/m³2026-02-16: 12.8 µg/m³2026-02-17: 19.1 µg/m³2026-02-18: 19.4 µg/m³2026-02-19: 22.1 µg/m³2026-02-20: 33.5 µg/m³2026-02-21: 35.3 µg/m³2026-02-22: 23.7 µg/m³2026-02-23: 30.3 µg/m³2026-02-24: 24.7 µg/m³2026-02-25: 19.2 µg/m³2026-02-26: 14.9 µg/m³2026-02-27: 26.0 µg/m³2026-02-28: 10.4 µg/m³2026-03-01: 13.7 µg/m³2026-03-02: 23.4 µg/m³2026-03-03: 7.9 µg/m³2026-03-04: 6.1 µg/m³2026-03-05: 11.9 µg/m³2026-03-06: 13.8 µg/m³2026-03-07: 22.0 µg/m³2026-03-08: 23.2 µg/m³2026-03-09: 21.2 µg/m³2026-03-10: 14.4 µg/m³2026-03-11: 21.7 µg/m³2026-03-12: 23.6 µg/m³2026-03-13: 19.9 µg/m³2026-03-14: 18.6 µg/m³2026-03-15: 21.5 µg/m³2026-03-16: 16.1 µg/m³2026-03-17: 11.3 µg/m³2026-03-18: 4.7 µg/m³2026-03-19: 9.4 µg/m³2026-03-20: 13.0 µg/m³2026-03-21: 17.0 µg/m³2026-03-22: 16.4 µg/m³2026-03-23: 20.8 µg/m³2026-03-24: 16.7 µg/m³2026-03-25: 13.4 µg/m³2026-03-26: 14.4 µg/m³2026-03-27: 20.6 µg/m³2026-03-28: 15.7 µg/m³2026-03-29: 18.3 µg/m³2026-03-30: 8.6 µg/m³2026-03-31: 11.6 µg/m³2026-04-01: 13.7 µg/m³2026-04-02: 10.8 µg/m³2026-04-03: 18.3 µg/m³2026-04-04: 15.1 µg/m³2026-04-05: 9.4 µg/m³2026-04-06: 10.2 µg/m³2026-04-07: 7.2 µg/m³2026-04-08: 13.8 µg/m³2026-04-09: 12.0 µg/m³2026-04-10: 8.6 µg/m³2026-04-11: 11.6 µg/m³2026-04-12: 8.0 µg/m³2026-04-13: 5.7 µg/m³2026-04-14: 6.0 µg/m³2026-04-15: 8.2 µg/m³2026-04-16: 8.3 µg/m³2026-04-17: 10.9 µg/m³2026-04-18: 42.5 µg/m³2026-04-19: 46.4 µg/m³2026-04-20: 31.4 µg/m³2026-04-21: 14.6 µg/m³2026-04-22: 13.1 µg/m³2026-04-23: 13.7 µg/m³2026-04-24: 8.0 µg/m³2026-04-25: 11.6 µg/m³2026-04-26: 20.6 µg/m³2026-04-27: 15.4 µg/m³2026-04-28: 14.1 µg/m³2026-04-29: 9.2 µg/m³2026-04-30: 8.0 µg/m³2026-05-01: 10.6 µg/m³2026-05-02: 17.3 µg/m³2026-05-03: 11.0 µg/m³2026-05-04: 11.7 µg/m³2026-05-05: 12.1 µg/m³2026-05-06: 12.4 µg/m³2026-05-07: no data2026-05-08: 14.1 µg/m³2026-05-09: 15.8 µg/m³2026-05-10: 19.8 µg/m³2026-05-11: 24.6 µg/m³2026-05-12: 15.6 µg/m³2026-05-13: 6.0 µg/m³2026-05-14: 6.0 µg/m³2026-05-15: 6.7 µg/m³2026-05-16: 8.6 µg/m³2026-05-17: 8.5 µg/m³2026-05-18: 11.9 µg/m³2026-05-19: 8.7 µg/m³2026-05-20: 9.3 µg/m³2026-05-21: 11.4 µg/m³2026-05-22: 10.9 µg/m³2026-05-23: 11.8 µg/m³2026-05-24: 12.0 µg/m³2026-05-25: 9.7 µg/m³2026-05-26: 9.2 µg/m³2026-05-27: 9.0 µg/m³2026-05-28: 8.9 µg/m³2026-05-29: no data2026-05-30: no data2026-05-31: no data2026-06-01: no data2026-06-02: no data2026-06-03: no data2026-06-04: no data2026-06-05: no data2026-06-06: no data2026-06-07: no data2026-06-08: no data2026-06-09: no data2026-06-10: no data2026-06-11: no data2026-06-12: no data2026-06-13: no data2026-06-14: no data2026-06-15: no data2026-06-16: no data2026-06-17: no data2026-06-18: no data2026-06-19: no data2026-06-20: no data2026-06-21: no data2026-06-22: no data2026-06-23: no data2026-06-24: no data2026-06-25: no data2026-06-26: no data2026-06-27: no data2026-06-28: no data2026-06-29: no data2026-06-30: no data2026-07-01: no data2026-07-02: no data2026-07-03: no data2026-07-04: no data2026-07-05: no data2026-07-06: no data2026-07-07: no data2026-07-08: no data2026-07-09: no data2026-07-10: no data2026-07-11: no data2026-07-12: no data2026-07-13: no data2026-07-14: no data2026-07-15: no data2026-07-16: no data2026-07-17: no data2026-07-18: no data2026-07-19: no data2026-07-20: no data2026-07-21: no data2026-07-22: no data2026-07-23: no data2026-07-24: no data2026-07-25: no data2026-07-26: no data2026-07-27: no data2026-07-28: no data2026-07-29: no data2026-07-30: 11.2 µg/m³2026-07-31: 7.7 µg/m³2026-08-01: 6.8 µg/m³2026-08-02: 5.3 µg/m³2026-08-03: 6.6 µg/m³2026-08-04: 9.1 µg/m³2026-08-05: 12.8 µg/m³2026-08-06: 10.6 µg/m³2026-08-07: 9.9 µg/m³2026-08-08: 27.5 µg/m³2026-08-09: 20.6 µg/m³2026-08-10: 23.7 µg/m³2026-08-11: 19.9 µg/m³2026-08-12: 17.9 µg/m³2026-08-13: no data2026-08-14: 9.2 µg/m³2026-08-15: 9.0 µg/m³2026-08-16: 14.1 µg/m³2026-08-17: 16.7 µg/m³2026-08-18: 11.9 µg/m³2026-08-19: 6.2 µg/m³2026-08-20: 7.0 µg/m³2026-08-21: 6.0 µg/m³2026-08-22: 6.9 µg/m³2026-08-23: 6.8 µg/m³2026-08-24: 8.3 µg/m³2026-08-25: 9.5 µg/m³2026-08-26: 10.6 µg/m³2026-08-27: 10.8 µg/m³2026-08-28: 12.7 µg/m³2026-08-29: 12.5 µg/m³2026-08-30: 14.9 µg/m³2026-08-31: 9.4 µg/m³2026-09-01: 5.9 µg/m³2026-09-02: 7.9 µg/m³2026-09-03: 8.8 µg/m³2026-09-04: 11.7 µg/m³2026-09-05: 20.9 µg/m³2026-09-06: 12.6 µg/m³2026-09-07: 21.3 µg/m³2026-09-08: 19.5 µg/m³2026-09-09: 14.8 µg/m³2026-09-10: 15.0 µg/m³2026-09-11: 20.1 µg/m³2026-09-12: 18.8 µg/m³2026-09-13: 11.4 µg/m³2026-09-14: 10.4 µg/m³2026-09-15: 14.5 µg/m³2026-09-16: 19.8 µg/m³2026-09-17: 19.6 µg/m³2026-09-18: 18.8 µg/m³2026-09-19: 19.0 µg/m³2026-09-20: 16.6 µg/m³2026-09-21: 18.8 µg/m³2026-09-22: 16.2 µg/m³2026-09-23: 18.1 µg/m³2026-09-24: 14.8 µg/m³2026-09-25: 15.5 µg/m³2026-09-26: 10.7 µg/m³2026-09-27: 9.7 µg/m³2026-09-28: 11.9 µg/m³2026-09-29: 9.7 µg/m³2026-09-30: 8.7 µg/m³
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

159 of 301 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#1906OctNovDecJanFebMarAprMayJunJulAugSep

Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 26.1 µg/m³Jan 2026: 24.8 µg/m³JanFeb 2025: 22.0 µg/m³Feb 2026: 21.5 µg/m³FebMar 2025: 17.8 µg/m³Mar 2026: 15.8 µg/m³MarApr 2025: 23.8 µg/m³Apr 2026: 14.2 µg/m³AprMay 2025: 14.1 µg/m³May 2026: 11.6 µg/m³MayJun 2025: 8.0 µg/m³JunJul 2025: 11.1 µg/m³JulAug 2025: 8.3 µg/m³Aug 2026: 11.8 µg/m³AugSep 2025: 7.6 µg/m³Sep 2026: 14.7 µg/m³SepOct 2025: 13.1 µg/m³OctNov 2025: 18.3 µg/m³NovDec 2025: 26.2 µg/m³Dec

Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 11.6 µg/m³11.620252025: 8.1 µg/m³8.1

Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
Mong KokDATA.GOV.HK terms (EPD)Hong KongReference

The city's value is the median of its reference monitors each hour; low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in Hong Kong

Wan Chai 21.7Tin Shui Wai 15.2Sham Shui Po 13.9Kwai Chung 13.7Fanling 13.7Tai Po 13.6Sau Mau Ping 13.5San Tung Chung Hang 13.5Tsuen Wan 12.7Aberdeen 12.4Victoria 12.3Sha Tin 11.5

30-day averages, µg/m³. All of Hong Kong →

Updated 2026-10-01 05:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.