SmogRank / Hong Kong / Yuen Long

Air quality in Tin Shui Wai

Yuen Long, Hong Kong. PM2.5 from 1 reference monitor, updated hourly.

9.4 µg/m³
Moderate

Latest hour (03:00 UTC), 0.6× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#277
of 2,341 · 14.0 µg/m³
30 days
#228
of 2,337 · 15.2 µg/m³
Year
#265
of 2,166 · 17.0 µg/m³

Why it ranks here

Seasonal. Over the past year its worst months were January, December, averaging up to 30.2 µg/m³ against 10.3 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

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

Last 4 days, hour by hour

15302026-10-01 02:00 UTC: 8.3 µg/m³2026-10-01 03:00 UTC: 9.4 µg/m³Sep 28Sep 29Sep 30

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

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 5.9 µg/m³2025-09-30: 10.2 µg/m³2025-10-01: 9.4 µg/m³2025-10-02: 8.9 µg/m³2025-10-03: 8.1 µg/m³2025-10-04: 10.7 µg/m³2025-10-05: 5.8 µg/m³2025-10-06: 7.4 µg/m³2025-10-07: 13.4 µg/m³2025-10-08: 12.0 µg/m³2025-10-09: 14.4 µg/m³2025-10-10: 13.4 µg/m³2025-10-11: 10.3 µg/m³2025-10-12: 6.1 µg/m³2025-10-13: 6.3 µg/m³2025-10-14: 5.3 µg/m³2025-10-15: 10.1 µg/m³2025-10-16: 14.0 µg/m³2025-10-17: 17.9 µg/m³2025-10-18: 21.5 µg/m³2025-10-19: 21.5 µg/m³2025-10-20: 7.4 µg/m³2025-10-21: 5.3 µg/m³2025-10-22: 6.8 µg/m³2025-10-23: 18.8 µg/m³2025-10-24: 21.8 µg/m³2025-10-25: 22.1 µg/m³2025-10-26: 24.6 µg/m³2025-10-27: 36.1 µg/m³2025-10-28: 36.0 µg/m³2025-10-29: 22.6 µg/m³2025-10-30: 21.9 µg/m³2025-10-31: 21.2 µg/m³2025-11-01: 19.8 µg/m³2025-11-02: 25.8 µg/m³2025-11-03: 25.3 µg/m³2025-11-04: 15.3 µg/m³2025-11-05: 10.2 µg/m³2025-11-06: 12.3 µg/m³2025-11-07: 9.5 µg/m³2025-11-08: 11.4 µg/m³2025-11-09: 19.1 µg/m³2025-11-10: 11.6 µg/m³2025-11-11: 12.3 µg/m³2025-11-12: 15.2 µg/m³2025-11-13: 10.3 µg/m³2025-11-14: 17.0 µg/m³2025-11-15: 20.7 µg/m³2025-11-16: 22.5 µg/m³2025-11-17: 21.5 µg/m³2025-11-18: 25.7 µg/m³2025-11-19: 13.0 µg/m³2025-11-20: 17.2 µg/m³2025-11-21: 20.4 µg/m³2025-11-22: 23.5 µg/m³2025-11-23: 38.1 µg/m³2025-11-24: 36.2 µg/m³2025-11-25: 22.8 µg/m³2025-11-26: 29.0 µg/m³2025-11-27: 20.8 µg/m³2025-11-28: 22.2 µg/m³2025-11-29: 27.8 µg/m³2025-11-30: 26.6 µg/m³2025-12-01: 29.3 µg/m³2025-12-02: 16.3 µg/m³2025-12-03: 34.4 µg/m³2025-12-04: 48.2 µg/m³2025-12-05: 44.2 µg/m³2025-12-06: 37.2 µg/m³2025-12-07: 42.4 µg/m³2025-12-08: 33.2 µg/m³2025-12-09: 29.1 µg/m³2025-12-10: 30.4 µg/m³2025-12-11: 39.3 µg/m³2025-12-12: 23.8 µg/m³2025-12-13: 25.1 µg/m³2025-12-14: 12.9 µg/m³2025-12-15: 18.6 µg/m³2025-12-16: 33.7 µg/m³2025-12-17: 34.1 µg/m³2025-12-18: 25.4 µg/m³2025-12-19: 23.5 µg/m³2025-12-20: 14.2 µg/m³2025-12-21: 23.3 µg/m³2025-12-22: 35.1 µg/m³2025-12-23: 17.2 µg/m³2025-12-24: 26.8 µg/m³2025-12-25: 19.0 µg/m³2025-12-26: 22.5 µg/m³2025-12-27: 37.3 µg/m³2025-12-28: 35.7 µg/m³2025-12-29: 35.4 µg/m³2025-12-30: 60.1 µg/m³2025-12-31: 27.1 µg/m³2026-01-01: 28.6 µg/m³2026-01-02: 14.8 µg/m³2026-01-03: 17.8 µg/m³2026-01-04: 30.2 µg/m³2026-01-05: 34.1 µg/m³2026-01-06: 24.0 µg/m³2026-01-07: 33.0 µg/m³2026-01-08: 20.7 µg/m³2026-01-09: 27.0 µg/m³2026-01-10: 32.3 µg/m³2026-01-11: 20.4 µg/m³2026-01-12: 33.1 µg/m³2026-01-13: 53.6 µg/m³2026-01-14: 34.9 µg/m³2026-01-15: 34.0 µg/m³2026-01-16: 31.9 µg/m³2026-01-17: 26.5 µg/m³2026-01-18: 23.0 µg/m³2026-01-19: 32.7 µg/m³2026-01-20: 19.3 µg/m³2026-01-21: 29.0 µg/m³2026-01-22: 25.6 µg/m³2026-01-23: 29.9 µg/m³2026-01-24: 51.4 µg/m³2026-01-25: 25.0 µg/m³2026-01-26: 15.4 µg/m³2026-01-27: 49.3 µg/m³2026-01-28: 36.7 µg/m³2026-01-29: 22.8 µg/m³2026-01-30: 19.0 µg/m³2026-01-31: 22.4 µg/m³2026-02-01: 18.7 µg/m³2026-02-02: 25.2 µg/m³2026-02-03: 26.2 µg/m³2026-02-04: 30.9 µg/m³2026-02-05: 28.3 µg/m³2026-02-06: 18.0 µg/m³2026-02-07: 21.7 µg/m³2026-02-08: 15.4 µg/m³2026-02-09: 18.0 µg/m³2026-02-10: 16.2 µg/m³2026-02-11: 22.5 µg/m³2026-02-12: 21.4 µg/m³2026-02-13: 24.7 µg/m³2026-02-14: no data2026-02-15: 12.6 µg/m³2026-02-16: 12.9 µg/m³2026-02-17: 20.6 µg/m³2026-02-18: 18.2 µg/m³2026-02-19: 23.1 µg/m³2026-02-20: 34.3 µg/m³2026-02-21: 31.7 µg/m³2026-02-22: 25.1 µg/m³2026-02-23: 26.4 µg/m³2026-02-24: 19.5 µg/m³2026-02-25: 20.3 µg/m³2026-02-26: 9.6 µg/m³2026-02-27: 15.7 µg/m³2026-02-28: no data2026-03-01: no data2026-03-02: 12.7 µg/m³2026-03-03: 8.9 µg/m³2026-03-04: no data2026-03-05: 13.3 µg/m³2026-03-06: 15.2 µg/m³2026-03-07: 18.3 µg/m³2026-03-08: 20.8 µg/m³2026-03-09: 20.4 µg/m³2026-03-10: 14.6 µg/m³2026-03-11: 19.7 µg/m³2026-03-12: 25.5 µg/m³2026-03-13: 18.1 µg/m³2026-03-14: 14.2 µg/m³2026-03-15: 17.1 µg/m³2026-03-16: 16.9 µg/m³2026-03-17: 14.4 µg/m³2026-03-18: 11.1 µg/m³2026-03-19: 12.0 µg/m³2026-03-20: 12.7 µg/m³2026-03-21: 16.5 µg/m³2026-03-22: 15.6 µg/m³2026-03-23: 24.6 µg/m³2026-03-24: 16.9 µg/m³2026-03-25: 17.5 µg/m³2026-03-26: 14.5 µg/m³2026-03-27: 17.4 µg/m³2026-03-28: 15.9 µg/m³2026-03-29: 14.2 µg/m³2026-03-30: 11.6 µg/m³2026-03-31: 15.0 µg/m³2026-04-01: 17.2 µg/m³2026-04-02: 12.2 µg/m³2026-04-03: 20.9 µg/m³2026-04-04: 17.7 µg/m³2026-04-05: 13.8 µg/m³2026-04-06: 11.7 µg/m³2026-04-07: 10.8 µg/m³2026-04-08: 11.3 µg/m³2026-04-09: 11.2 µg/m³2026-04-10: 10.6 µg/m³2026-04-11: 12.0 µg/m³2026-04-12: 8.9 µg/m³2026-04-13: 7.8 µg/m³2026-04-14: 9.1 µg/m³2026-04-15: 9.9 µg/m³2026-04-16: 9.4 µg/m³2026-04-17: 13.9 µg/m³2026-04-18: 47.9 µg/m³2026-04-19: 47.0 µg/m³2026-04-20: 32.1 µg/m³2026-04-21: 15.1 µg/m³2026-04-22: 14.2 µg/m³2026-04-23: 13.2 µg/m³2026-04-24: 8.7 µg/m³2026-04-25: 13.6 µg/m³2026-04-26: 18.9 µg/m³2026-04-27: 16.3 µg/m³2026-04-28: 11.0 µg/m³2026-04-29: 8.8 µg/m³2026-04-30: 11.1 µg/m³2026-05-01: 11.7 µg/m³2026-05-02: 12.8 µg/m³2026-05-03: 10.7 µg/m³2026-05-04: 12.1 µg/m³2026-05-05: 10.5 µg/m³2026-05-06: 10.3 µg/m³2026-05-07: 10.8 µg/m³2026-05-08: 15.8 µg/m³2026-05-09: 12.4 µg/m³2026-05-10: 16.5 µg/m³2026-05-11: 23.0 µg/m³2026-05-12: 16.9 µg/m³2026-05-13: 7.4 µg/m³2026-05-14: 5.6 µg/m³2026-05-15: 5.3 µg/m³2026-05-16: 5.5 µg/m³2026-05-17: 5.1 µg/m³2026-05-18: 7.2 µg/m³2026-05-19: 5.5 µg/m³2026-05-20: 7.7 µg/m³2026-05-21: 7.8 µg/m³2026-05-22: 9.2 µg/m³2026-05-23: 11.8 µg/m³2026-05-24: 10.8 µg/m³2026-05-25: 8.6 µg/m³2026-05-26: 8.3 µg/m³2026-05-27: 8.7 µg/m³2026-05-28: 10.3 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: 7.1 µg/m³2026-07-31: 5.8 µg/m³2026-08-01: 5.1 µg/m³2026-08-02: no data2026-08-03: no data2026-08-04: 7.4 µg/m³2026-08-05: 10.9 µg/m³2026-08-06: 11.8 µg/m³2026-08-07: 13.5 µg/m³2026-08-08: 23.8 µg/m³2026-08-09: 20.2 µg/m³2026-08-10: 19.7 µg/m³2026-08-11: 17.6 µg/m³2026-08-12: no data2026-08-13: no data2026-08-14: 7.8 µg/m³2026-08-15: 9.0 µg/m³2026-08-16: 15.4 µg/m³2026-08-17: 15.8 µg/m³2026-08-18: 11.8 µg/m³2026-08-19: 6.6 µg/m³2026-08-20: 5.1 µg/m³2026-08-21: 4.3 µg/m³2026-08-22: 6.5 µg/m³2026-08-23: 7.5 µg/m³2026-08-24: 8.0 µg/m³2026-08-25: 7.5 µg/m³2026-08-26: 7.2 µg/m³2026-08-27: 10.7 µg/m³2026-08-28: 12.0 µg/m³2026-08-29: 13.4 µg/m³2026-08-30: 15.6 µg/m³2026-08-31: 9.7 µg/m³2026-09-01: 7.5 µg/m³2026-09-02: 8.5 µg/m³2026-09-03: 7.7 µg/m³2026-09-04: 9.8 µg/m³2026-09-05: 21.7 µg/m³2026-09-06: 11.6 µg/m³2026-09-07: 19.9 µg/m³2026-09-08: 20.8 µg/m³2026-09-09: 12.8 µg/m³2026-09-10: 14.5 µg/m³2026-09-11: 21.1 µg/m³2026-09-12: 19.8 µg/m³2026-09-13: 9.2 µg/m³2026-09-14: 12.1 µg/m³2026-09-15: 12.1 µg/m³2026-09-16: 17.3 µg/m³2026-09-17: 19.3 µg/m³2026-09-18: 19.1 µg/m³2026-09-19: 16.5 µg/m³2026-09-20: 19.1 µg/m³2026-09-21: 21.8 µg/m³2026-09-22: 17.6 µg/m³2026-09-23: 17.3 µg/m³2026-09-24: 16.2 µg/m³2026-09-25: 16.7 µg/m³2026-09-26: 13.5 µg/m³2026-09-27: 13.6 µg/m³2026-09-28: 13.3 µg/m³2026-09-29: 13.3 µg/m³2026-09-30: 11.2 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

167 of 295 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#1917OctNovDecJanFebMarAprMayJunJulAugSep

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

2026 against 2025, month by month

15Jan 2025: 27.6 µg/m³Jan 2026: 29.0 µg/m³JanFeb 2025: 20.6 µg/m³Feb 2026: 21.4 µg/m³FebMar 2025: 16.4 µg/m³Mar 2026: 16.1 µg/m³MarApr 2025: 20.6 µg/m³Apr 2026: 15.5 µg/m³AprMay 2025: 13.5 µg/m³May 2026: 10.3 µg/m³MayJun 2025: 6.3 µg/m³JunJul 2025: 11.3 µg/m³JulAug 2025: 8.2 µg/m³Aug 2026: 11.3 µg/m³AugSep 2025: 7.7 µg/m³Sep 2026: 15.2 µg/m³SepOct 2025: 14.9 µg/m³OctNov 2025: 20.1 µg/m³NovDec 2025: 30.2 µg/m³Dec

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

This week against past years

This weekThis week: 14.0 µg/m³14.020252025: 7.4 µg/m³7.4

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

Monitors

StationOperatorType
Yuen LongDATA.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 21.7Mong Kok 14.7Sham 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 04:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.