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 10 Dec 2025: Tuen Mun 30.1 µg/m³, Wan Chai 28.7 µg/m³ and Tin Shui Wai 26.3 µg/m³.
- 1Tuen MunTuen Mun30.1
- 2Wan ChaiWan Chai28.7
- 3Tin Shui WaiYuen Long26.3
- 4San Tung Chung HangIslands24.6
- 5Tai PoTai Po22.8
- 6Mong KokYau Tsim Mong District22.6
- 7Sham Shui PoSham Shui Po District22.5
- 8Kwai ChungKwai Tsing District21.7
- 9FanlingNorth District21.7
- 10Tsuen WanTsuen Wan21.5
- 11Sha TinSha Tin20.6
- 12Sau Mau PingKwun Tong District20.2
- 13VictoriaCentral and Western19.9
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.