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 Nov 2025: Wan Chai 23.6 µg/m³, Tuen Mun 19.1 µg/m³ and San Tung Chung Hang 17.6 µg/m³.
- 1Wan ChaiWan Chai23.6
- 2Tuen MunTuen Mun19.1
- 3San Tung Chung HangIslands17.6
- 4Tin Shui WaiYuen Long16.9
- 5FanlingNorth District16.2
- 6Tai PoTai Po15.6
- 7Mong KokYau Tsim Mong District15.2
- 8Sham Shui PoSham Shui Po District15.1
- 9Kwai ChungKwai Tsing District14.8
- 10Tsuen WanTsuen Wan14.3
- 11Sau Mau PingKwun Tong District13.7
- 12VictoriaCentral and Western13.7
- 13Sha TinSha Tin12.8
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.