SmogRank / History / City race
Cities in Hong Kong, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Hong Kong for PM2.5 over the 30 days to 13 Dec 2025: Tuen Mun 32.0 µg/m³, Wan Chai 29.9 µg/m³ and Tin Shui Wai 27.9 µg/m³.
- 1Tuen MunTuen Mun32.0
- 2Wan ChaiWan Chai29.9
- 3Tin Shui WaiYuen Long27.9
- 4San Tung Chung HangIslands26.1
- 5Tai PoTai Po24.2
- 6Mong KokYau Tsim Mong District24.0
- 7Sham Shui PoSham Shui Po District23.9
- 8Kwai ChungKwai Tsing District23.0
- 9FanlingNorth District22.8
- 10Tsuen WanTsuen Wan22.3
- 11Sha TinSha Tin22.0
- 12Sau Mau PingKwun Tong District21.6
- 13VictoriaCentral and Western21.2
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.